I have a chat-based interface (see sigmnd.com) that needs a new avatar. I'd like the circular illustration to be of a wise old woman. It should look good and have some detail at a large size (150px), but also work well visually when shrunk (40px).
The woman should have very kind eyes and be smiling slightly. She should make you feel warm and happy when you look at her. She doesn't have to have white skin -- native american or east indian skin tones could also work.