His stuff is not merely unrealistic; it's impossible. Even those who create fantasy have to stay within the bounds and rules of their own creation. Otherwise it is all meaningless.
He has a couple of cheap tricks with light that he has run into the ground - tricks that were known long ago and have been used better by people who actually understand light, perspective, anatomy, botany, etc. What you see as "beautiful" is merely a conjuring trick. Others do it better, and can actually paint.