You have two options to have photos removed:
1. Contact the listing agent of the sold property as that agent can log onto the Trulia site and delete the photos.
2. Contact Trulia to have them remove the photos. To do this; click on your name in the upper right hand corner and a drop down menu will appear. Click on the "help" tab. A new screen will appear where there is a tab that says "contact us". Here you will be able to send Trulia an email requesting to have the photos removed. Be sure that you include the entire address.
Hope this helps. Good luck!