StormCat That's a tall order. You would probably have to find a painting in private hands and then that owner would have to license the image. And then I wouldn't count out BRI claiming a copyright of some sort anyway.
One could scour the internet for a hi-res image and send it off to be printed by Snapfish or whatever, or a scan from a book, but that would be illegal, I'm sure.
What Bob would have rather have you do, I think, is make your own painting. 😁