I love Kay Nielsen if he counts! He did some things for Disney too I think, but he was a golden age illustrator. I've had a number of avatars of his artwork. They're just so delicate and lovely, and I love the fantasy, too!
Here are a few favorites from him:
And recently I discovered (thank you pinterest feed) Yoshitaka Amano, and I've really been enjoying his work too. Some of his that I like a lot, including my current avatar: