Easiest way to transfer custom photos between game saves?

This time it's about photos on the wall, not painting. Not sure if that makes any difference technically. Name f photographer is not important, I mainly wants this household to have the photos on the wall, visually.

And yes, I too have seen painting details going lost over time. It's a little sad if it was painted by a long lost relative, but it's just one of those details I can live with. I pretend the painting is so old that nobody can remember who made it, and the artist forgot to sign :)