Her arm looks kind of weird, though it could just be muscular. Her fingertips are just barely in the frame, I'd prefer they had more space. And speaking of space, I think all of her, uh, shorts (if not her legs) should be in the frame.
That said, I like the directional lighting (off-camera flash?) and the pose is really good. Her expression is quite intense -- much like her game (I would imagine).