>>96577628
I don't think it's any trickier than investigating a normal crime scene. There's infinite ways you can set it up. Like: You know a picture was taken by a camera with XY specs and when it was taken but not where. Via other leads you find a camera that matches the specs. You have the owner's movements from his phone so you find out where he was at the time the photo was taken and go there.
You try to find the exact location the photo was taken.
The GM describes the layout of the house but the photo has three doors in the corridor while the real house has two. Someone's plastered over the basement door.
Just off the top of my head. You might have to build it around the details of the pictures you generate rather than designing the pictures to match, but that's not so bad.