Try these curated collections

Illustration of a Kraken or giant octopus in the storm, spindrift near seashore
Mythological vintage sea monster. Monochrome Hand drawn sketch. Vector seamless pattern for boy. Detail of the old geographical maps of sea.
Tentacles of an octopus. Hand drawn vector illustration in engraving technique isolated on white background.
Giant Kraken with Girl Beast Master Rising out of the Sea 3d illustration 3d render miniature Lord of the Print
Sea Monsters of background, 3d rendering
An mosasaurus swims towards you in shallow seas.  This creature was an aquatic reptile that lived in the ocean during the Cretaceous period. 3D Rendering
Giant octopus catches old style sail ship hand drawn vector illustration
Hand Drawn Sea Monsters
Hand Drawn Vector Tentacles in a rough wood cut style (each tentacle is a separate illustration and can be rearranged or colored as desired).
Narcissus Nicaise perilous adventures in the Congo. He had before him a fearsome sea monster, vintage engraved illustration. Journal des Voyage, Travel Journal, (1880-81).
Great white shark zombie attacks in a jump. A giant zombie shark attacks jumping out of the sea into Halloween.
3d illustration of a Deep Sea Diver facing down a giant monster/squid/alien
Hand Drawn Vector Tentacles in a rough wood cut style (each tentacle is a separate illustration and can be rearranged or coloured as desired).
3d fantasy illustration,Woman being attack by a sea monster,book cover or book illustration concept background
Underwater scene with prehistoric monster  and sunken ship
Evil skull-octopus mascot in engraving technique. Vector illustration isolated on white.
An elasmosaurus swims away from you in shallow seas.  This long necked plesiosaur was an aquatic reptile that lived in the ocean during the Cretaceous period. 3D Rendering
Original illustration of an octopus or cthulhu monster in a vintage woodblock woodcut retro style.
Water Dragon Computer generated 3D illustration
Tentacles Octopus Underwater Marine Animal Background Card for Presentation, Marketing or Promotion. Vector illustration of Kraken or Squid
Sea Monster Illustrations in a vintage style.
Green Sea monster with sharp teeths
Hand Drawn Sea Monsters in woodcut style (each creature/tentacle is an individual vector and can be separated from groups and rearranged)
illustration with underwater monster dragon
Red octopus tentacles closeup in sea water with splashes over blue background, summer under water landscape with oceanic giant squid, cephalopods monster with spiral organ.
Kraken in the sea at sunset
Art concept of giant octopus tentacles underwater and boat is sailing in sea. 3d digital illustration.
Night scene with a pirate ship pulled into water by tentacles
Tentacles of an octopus. Hand drawn vector illustration in engraving technique on dark background.
An octopus with an almost red and pink marbled skin moves among brown coral in an ocean shallow. The creatures tentacles whip around as it scuttles through the aquatic landscape.
Kraken decorative emblem with sail ship in giant monster tentacles colored sketch vector illustration
warrior standing looking Cthulhu,Cosmic monster, sea monster,strom bad weather ,digital art, Illustration painting.
3d render of sci fi sea alien underwater shark monster creature
Octopus art. Painted octopus digital drawing. Illustration of octopus, sea monster on a white background.
Night scene with old ship,sharks, sea and monster with tentacles
Pirate board game for children. Map of the treasure hunter. Corsair ship and sea monsters in isometric style. Chest of gold on tropical island. Vector illustration
Photo composite of Loch Ness Monster
Octopus black silhouette of sea monster. Evil kraken or giant deep water beast with curved tentacles isolated symbol for tattoo, nautical heraldry or marine club emblem design
skull kraken monster vector illustration for your company or brand
Sea monster with tentacles and claws. Vector isolated character.
Vector illustration dark blue angry octopus and bubbles on dark blue background.
Tentacled horror 3D illustration
Monsters set illustration
A collection of very high detail ornaments designed to illustrate vintage or "treasure" maps
Design graphic set with sea mythologycal creatures, ships, mermaid and marine symbols for maps, logo. Engraved illustrations. Pirate adventures, treasure hunt and old transportation concept.
cartoon boat and monster octopus
Japanese water dragon a traditional mythological deity creature in the sea or river splashes. Tattoo style vector illustration
5 Black Tentacles from depths of the sea, hand drawn
You have entered the underwater realm of the styxosaurus, a plesiosaur of the Cretaceous era. This 30 to 40 foot long aquatic reptile once swam the ocean in the time of the dinosaurs. 3D Rendering
Black danger cartoon octopus characters with curling tentacles swimming underwater, isolated on white. Tattoo or pattern on a t-shirt, poster or logo, vector illustration
Set of decorative elements for the design of an old geographical map. Ancient caravel, sea monsters, anchor, framework for inscriptions, cartouche.
Sea serpent, mythological snake monster drawing. Cartoon vector ilustration.
Sea monster floating on the waves of the sea. Drawing by hand. Figure style zentangle, doodle pattern. Vector illustrations isolated on white background. Coloring book page.
Octopus hand drawing vintage engraving illustration on white backgroud
Cartoon shark mascot show his muscle arm . Vector clip art illustration with simple gradients. All in a single layer.
sea serpent green orange vector illustration
Vector illustration of kraken in ocean. Flat  style.
mythological octopus tentacles with the sea on a white background
Giant evil kraken absorbs commercial sailing ship, silhouette octopus sea monster with tentacles for logo and t-shirt print or seafood mascot label, simple detailed black vector illustration
A large vintage, ancient world map, drawn by hand with dragons, sea monsters and ancient sailboats. Adventures and pirates, 
ancient treasures and quests.
The Kraken is a creature of Scandinavian folklore said to be appear like a giant octopus or squid, a legendary monster capable of bringing down ships. 3D Rendering

Search for "sea monsters" in these categories

Cthulhu monster from the deep of the sea, shipwreck in the first plan. Photo manipulation, 3D illustration
Neptune and monsters illustration
Tentacles of an octopus label frame design. Hand drawn vector illustration in engraving technique isolated on white.
Mythological vintage sea monster. Fragment of decoration old pirate map
 Color vector  illustration of octopus tentacles in the waves
Vector drawing of/Tentacles with copy space/Easy to edit layers and groups, tentacles viewable under other tentacles for editing, gradients only used in the background layer.
Kraken attacking an ancient ship
Set of vintage sea monsters. Vignette with a sea dragon. Design on the theme of pirates, adventures, discoveries, old sailboats. Painted by hand. Vector. EPS10.
Mythological vintage sea monster. Dragon. Fragment of old pirate map. Hand drawn vector sketch.
Fantasy scenery with monster and evil sorceress. 3D illustration.
Modern professional logo for sport team. Kraken mascot. Octopus, vector symbol on a dark background.
Mythological vintage  monster. Fragment of old pirate map. Hand drawn vector sketch.
"Be creative" poster with tentacles of an octopus. Hand drawn vector illustration in engraving technique isolated on white background.
Monsters set illustration
The ancient giant sea monster Cthulhu, which has risen from the bottom of the ocean, has many tentacles on its face, its eyes glow with red light. 2D illustration
Old World Sea Dragon
An mosasaur swims towards you in shallow seas.  Mosasaurs were a group of aquatic reptiles that lived in the ocean during the Cretaceous period. 3D Rendering
Old caravel, vintage sailboat, sea monster. Monochrome Hand drawn sketch. Vector seamless pattern for boy. Detail of the old geographical maps of sea.
Octopus art. Painted octopus digital drawing. Illustration of octopus, sea monster on a white background.
Mermaid woman. Sea siren. Antique Mythical Greek monster. Mythological animal. Ocean symbol. Fantastic creatures in the old vintage style tattoo. Engraved hand drawn old sketch.
Mosasaurus, huge ocean lizard, extinct Mosasaur between 70 and 66 million years ago (3d illustration)
Jonah and the whale
Mythological vintage sea monster. Monochrome Hand drawn sketch. Vector seamless pattern for boy. Detail of the old geographical maps of sea.
Diver helmet with octopus tentacles drawn in tattoo style. Vector Illustration.
A painting of sea fish that is green
An original illustration of an octopus or cthulhu monster in a vintage woodblock or woodcut retro style.
Octopus behind a dusty scratched glass
Hand Drawn Vector Tentacles in a rough wood cut style (each tentacle is a separate illustration and can be rearranged or colored as desired).
Sea Dragon 01 - A fearsome Sea Dragon checks out an anchor and chain in the coastal seas.
Great white shark hunted by a big deep sea monster fish, depths of the ocean, hunter becomes the hunted, 3d render
Black and white  vector images based on sea legends and stories
Antique map of Northen Sea (1572, fragment_4)
Tentacle Illustration
Vector set of deep sea fish in blue isolated on white background. Angler fish with yellow sharp teeth and school of little fish.
Old caravel, vintage sailboat, sea monster. Monochrome Hand drawn sketch. Vector seamless pattern for boy. Detail of the old geographical maps of sea.
The Leviathan. Legendary sea monster giant whale hand drawn vector illustration
3d-illustration of an isolated fantasy dragon fish
Mythological vintage sea monster. Fragment of decoration old pirate map. Hand drawn sketch vector
Deep ocean water monster fish.
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