Per Shutterstock policy, there may only be one contributor for each account. Each account owner must wholly own full copyright to any content that they upload within their Shutterstock account.
Accounts cannot be shared between spouses or other family members. Accounts cannot be registered to the names of spouses or other family members if the content submitted is created by someone else. For example, if a husband and wife are both photographers who want to license their images with Shutterstock, they must each create a separate account. They cannot register an account just to the wife's name and submit content that was created by both of them into that portfolio.
Account ownership or payments can be shared if you have a Shutterstock business account. Learn more about registering as a business here:
Can I register for a contributor account as a business?