Super super super fun. seriously you have something that comes along the line of Pokémon snap. it would be so cool to have different types of backgrounds. forest, beach city, then what you had. Or maybe even find some known location city scapes or backgrounds would be sweet too.
If you wanted to go further, you could figure out which points of the background look really good and do some type of point system. you could even do a little story how you do like postcard photos or something.
Only gripe i had where the trees. I think it was a bit of an odd choice to have them what looks like to be floating above the railing. I think you could have lowered them a bit more and it would have wrapped up nicely. And honestly the trees might have been to much because i just really enjoyed those backgrounds. or even maybe if you caught a tree in the background of the photo it would be less points.
Nice Concept!