Tip to safeguard your paintings and photographs
I know a lot of us have been plagued with in-game photos and paintings going black for various reasons, sometimes reversable, sometimes not. Today it happened in my game. For no good reason, all paintings Abigail made of her and Joseph's honeymoon to Windenburg were black. I had hoped to keep them for future generations so it upset me quite a bit.
Then I discovered I had a much older save hiding in my list, so on the off chance that they weren't corrupted there I opened it and there they were. So how to get them into my current save? Well I simply made a room with just the paintings in it, saved it to my library and then I could download it into the active/current save from there.
From now on, if I have pictures that I feel are important in game, I will make sure to do this with all of them, thereby protecting them from corruption. I hope this can help anyone save their pictures too, before they are irreparably corrupted by whatever patch or update that we might get down the road.