I couldn’t have put it better myself. You’ve said lots of philosophical words without actually addressing any of my questions:
How do you distinguish between a person who really understands beauty, and someone who has enough experience with things they’ve been told are beautiful to approximate?
How do you distinguish between someone with no concept of beauty, and someone who sees beauty in drastically different things than you?
How do you distinguish between the deviations from photorealism due to imprecise technique, and deviations due to intentional stylistic impressionism?