Hey guys, a friend of mine just wrote a book and I thought I'd plug it here. It's called Facial Expressions by Mark Simon, and it's basically a catalogue of nothing but facial expressions from all kinds of people of all ages and races. It also has full turn arounds for hair, hats, hair and just about anything you can think of.
I also contributed a pic to the book to show how these photos can come in handy. It's a really great book and I highly recommend it.