I don't have a picture of you without facial hair and I'm not looking at a picture of her at the moment, so I'm going on memory, but it's something around the eyes and nose, length of face and general face shape, physically. Otherwise, it's a somewhat amused/skeptical expression that seems to live in the eyes and the mouth - the barest hint of a crinkle around the corners of the eyes and a tilt to the lips that might be a smile, just as likely isn't, but is very engaging. One of those expressions that make me wonder what the photographer just said, or what the subject was thinking just as the picture was snapped.

You're kind of doing it in the icon.