It's just pulling a pic from Google Streetview. There's no benefit to you to changing what's on this website. You can't sell your house here directly anyway. You can upload an FSBO listing on other sites and that info will eventually feed over here but if you'll scroll through these threads, you'll find that people have issues left and right with that data not transferring and getting the for sale listing to disappear from this site.
If you list your home with an agent (which is a far better choice) the photos they put in the MLS will flow over here and replace the basic one Trulia shows now.