Nice character and I like the dismount. Maybe you could find a way to get some secondary motion on the hair?
The run is a little odd in the way that the legs suddenly pop backwards once they have left the ground.
Also, the amount that the body bobs up and down is kinda between a run an a jog. In a jog, the body bobs up and down a fair bit, but in a fast sprint (I guess this is what you are going for here) the body doesn't really bob so much.