Would be more interesting to apply this photo transformation given, as an input, not only the painting the artist produced but also a photograph of the thing the artist was trying to represent. Otherwise all you are doing is recreating the artist's visual tools, not the way the artist translates what they see into the visual palette.

But then, if you tell the algorithm that The Scream is just a painting of a man on a bridge... you're not going to get a very good result.