It lacks hip movement, coming from the waist. It looks very unbalanced as if all the chest muscles are completely tightened because the bump from back to forth is now completly ignoring motion and gravity (still talking hips/lower torso here).
Also the back foot is sliding way too much based on the amount of weight that leans on it. It should be lifted from the ground slightly to even move like that I think, which can't be with how the weight is placed right now.
Not a bad job though =)