Ideas
Paint from reference does not work properly. When you paint from reference it seems to work at first. You're able to take a picture and then paint the picture and the painting shows up as intended. After you have saved your game and reload your save the painting has gone blank.
Playing around with it I noticed that the picture goes blank straight away if I move it in and out of the sim's inventory. But the painting shows up again if you keep replacing the painting on the wall. You could also sometimes see the painting in sim's inventory but when moved on to a wall it would go blank. When moving in and out of the lot in game the painting would not go blank. Only after reloading the save.
Other paintings work fine! The issue is only with paintings painted from reference. Seems like the picture taken for the painting is not saving properly.
Happens 100% of the time and happens both in new & old saves and with no mods.
Hope this would get fixed as it is such a cool feature!