Question about the type of pictures.
Is it just paper pictures, or can he do digital. And if it is paper, are they printouts from a printer, or the old fashion picture paper.
I used to be a big photographer. I used to do the whole darkroom thing. The chemical that covers a photo paper used to be based on silver. These days, they can be printed with laser ink. Two different types of chemistry there.
It would be interesting to know if he was limited to the old silver paper, or the printer paper, or digital images, or if he could do all three.
If he can do just the old silver based photographs, then he must have some kind of control on that particular element. If he can do all three types, then his control must go deeper.