Well, it's really blurry and the horizon is slanted. The subject is over exposed and you can't see her face. The crop is too tight. There is no sence of hight to the jump. This shot, for me would be a throw away. Do you have any other shots from the dance ?
I am afraid I have to agree with Keith, the picture is too soft, centred and badly exposed. It looks like you shot at a very high ISO and cropped a whole lot. 1/750 should stop the action so it must be heavily cropped.
Shooting at 200mm wide open is kind of a bad combination to begin with, but then to shoot it at 3200 and crop it is a recipe for very bad juju. I understand that there are just a whole lot of reasons that made this a tough shot to capture. When presented with something like this, I try converting it to B&W or a sepia tone and see what I get. Also, you don't need to shoot at 1/750. Close your lens down by a stop and you'll still get almost 1/400 which should be plenty, and make the image at least a little less squishy.
