I need you to point me some things about it that I would need to change. Specially in the lenght of the limbs, which would need a change in the bone structure. For start i think arms are longer than the original.
It is difficult to tell when comparing a small sprite with a 3d model, so I'm not 100% sure on any of these, but from comparing with original, I'd probably say :
Arms maybe "half a hand" length shorter
Elbows "half an elbow" higher up
Upper arm slightly fatter
Knees "half a knee" higher up
Legs a bit fatter overall
I think leg length is correct already
Smaller boobs :-(
Other than that, looks awesome.