This is an image I took a while ago. Going back through pictures, this one caught my eye because she's looking directly into the camera. It's very confrontational. She isn't really reacting. She's just looking at you. It's an interesting contrast because she has such a sweet face, yet you don't really know what's going on in her head. But she's obviously thinking something.
I really enjoy pictures like this one, where the subject is addressing the viewer, as opposed to reacting to the photographer.