Disney Concept Art: Tangled. I think Tangled is the most beautifully done Disney film yet. The advent of digital animation has really allowed for characters to take on a less cartoonish cast. But part of me misses the hand-drawn characters...
Mary Blair’s concept drawings for Cinderella (1950)
Young Carl and Ellie / 17 Pieces of Stunning UP Concept Art
Mary Blair 50 Beautiful Pieces Of Concept Art From Classic Disney Movies
Mulan sketches. I hardly ever see any for Mulan, which is a bummer, because she's a beautiful character!