It is suppose to be that once you update your photos on the MLS then they will eventually transfer over by feed into this site but that doesn't always happen.
You can claim your listings on this site as the Broker and delete the old photos and insert the new ones yourself. If you already are posted as the listing agent for the property then click on your "Listings" tab under your name in the right hand corner of the screen and then click the "edit" tab for that listing to edit and update the photos. Otherwise; bring up the address on this site and then click the "Claim this property" to have the property placed under your listings on the site.
If you still experience some problems then call Trulia at 888-466-3501 M-F from 7:00am-4:00pm PST.
Prudential Connecticut Realty