I've only read the first ten pages of "Color and Light" by James Gurney, but it's already great reading. He's a great teacher and writes in a very clear way. If you're interested in color or painting definitely give it a look.
I don't have the "Design" book from the Disney Feature Animation Book series yet, but by all accounts it's as great as the first two editions in the collection ("Animation" and "Story").
And lastly, "The Art of Tangled" is a beautiful book, featuring tons and tons and tons of beautiful visual development and storyboards from the film. It's really a great-looking book and worth checking out.