All art is subjective. Any attempt to "verify" a piece of art would be entirely dependent on cultural and personal sensitivities. Art isn't a math problem with a solution.

But you can dissect it into concepts and see if it is something truly new to the model - if the output contains things which aren’t there in the weights, you have a nice specimen to study and, crucially, a recipe to get a bunch of matrices to output untrained things.

This is like saying: All cooks are equally good, even the most disgusting slop (e.g. water/flour soup) isn't any better than a dish from a cook with several Michelin stars. Of course the latter is better. And if it is better, it is objectively better. Even if 0.001% of people prefer flour soup.

> culture/lived experience of the specific population viewing the painting

Isn't this lived experience baked into LLM language bases? It's certainly very hard to target all possible populations at once. And art doesn't need that, doesn't do that. Only rare marketing sometimes attempts to do that and only in very limited ways, such as a brand name acceptable all over the world.