If a real estate agent posted the pictures, discuss the problem with him/her. You can't remove those pictures yourself.
If the home you purchased is still listed on Trulia for sale, you can alert our Customer Service team (email@example.com), or you can send them an email via the link below. They can then update the home's status and remove the listing information. If you choose the latter method, please be sure to include a link to the property in question, or the complete property address.
Ali, Community Manager
Web Reference: http://www.trulia.com/help/ask/
If you are referring to another site you would need to be more specific.
Also, when photos are posted, they are sometimes posted to other websites.
If you need any assistance please call me.