Interesting article in October's Psychology Today on research by Sam Gosling. Mixed Signals: You likely see yourself very differently from the way others see you. A little self-awareness can prevent a lot of misunderstanding.
Worth getting actual print copy for the pictures. I highly encourage you to capture your first impression before looking at the author's results. Michael and I had very different results. I love Gosling's work but my research is more around understanding what it is we are actually seeing in the face or demeanor.