This would be a great time to use AI, because it is very good at style transfer. Feed it a lot of contemporary painted art, feed it the base-coat version of the sculpture, and ask it to style-transfer the paintings on to the sculpture. You'd likely get something very close, and for once we can use "The computer said it, I'm not responsible for it!" for the power of good, by making it so no human is responsible for the heinous crime of assuming something without historical evidence (no matter how sensible the assumption is).

(And lest someone be inclined to downvote because I'm suggesting an AI, the real sarcastic core of my message is about our faith in computers still being alive and well even after we all have decades of personal experience of them not being omniscient infalliable machines.)