PKmayonnaise covered the basics of the coloring. I'm still having issues with the animation itself. Very smooth, yet. But reallistically, I'm not understanding it. Is he just moving his lips? If so, then yes this makes sense. However, if he is talking, then I believe his lower jaw should also be moving down some.(try standing in front of a mirror, and start talking normally to yourself, with your hand about half an inch beneath your chin or jaw. I'm pretty sure you'll notice your chin hits your hand when you speak. Even smaller words, without emphasis, still produce movement of the jaw. Also, it's more believable, as he just looks like a robot.) And don't forget how many muscles it takes to smile or frown. Take this into consideration when animating realistic pieces like this.( i.e. other parts of the face will shift a bit, other than the obvious.)
Still looking great though.