I saw this on YouTube. Eric Goldberg is an amazing animator at Disney... if you're an animator he's a household name... The part 3 video shows Eric drawing Louis (the Gator from Princess and the Frog), he was the Lead Animator on Louis. It's amazing to watch him draw and if you've seen the movie you'll agree that the animation on Louis was breathtaking! So fluid and organic feeling. Pure Awesomeness. These are filmed at the Walt Disney Studios. Part 4 talks about clean up, it's pretty cool.
He also has a book that I recommend to everyone either in animation or just starting out. It's called: Character Animation Crash Course.