Shutterstock images may not be used together with pornographic, defamatory, or otherwise unlawful or immoral content. Using images may also not be used in a way that infringes upon any third party's trademark or intellectual property.
Images With Recognizable People:
There are additional restrictions if the image depicts a person who is recognizable:
ads for adult entertainment or similar clubs and escort or dating services
implying that a model is sick or took medication
defamatory, unlawful, offensive or immoral content--for example implying that a model is a criminal or suffers from a physical or mental infirmity.
However, you may use images that do not depict a recognizable person.