I had an idea a little while ago and been playing around with it and all tho it's not a perfect solution, if you use the camera to take a picture of the place or person you want a painting of then put that picture on the wall opposite of your easel and use the paint from reference and zoom in on the picture you placed on the wall you can get a painting of it.
I've only tried this a few times so far and sometimes the painting looks grainy and sometimes it's not bad, but I did say it's not a perfect solution.
I haven't tried playing around with the different filters for the picture to see what difference that might make to the looks of the painting.
Just a idea I had that was showing some promise and thought I would window out of the game and mention it.