Today, I was reminded of the importance of labeling every little thumbnail and drawing. It's not as obvious if the client sits permanently in the room with you, but if you ever have to talk about something over the phone, by instant messenger or email, it's much easier to locate "Sally #6" than "The fifth image from the right, six images down, the one with the blueish hat and red feather. No no not that one, the other one just next to it'.