> "Avoid pastel/airbrush/oil style art or images of people."

I would also suggest the AI avoid trying to make realistic-looking musical instruments, because I've never seen an AI poster with a correct musical instrument. The uncanny-valley of an attempted instrument that has clear deformities hurts my brain and gives me the creeps. If you want a real instrument, just copy-and-paste a real instrument. Alternative maybe let the AI generate a cartoonish or clip-art-style musical instrument, so my brain isn't bothered by the disconnect between something that is trying to look real but isn't.