Hmmm, let's see.......Morph ball shading might need more work, need to make it look more spherical (darkest tone needs to be curved a bit at the bottom a bit), and arm cannon placement should be the same on standing and shooting pose, not on different arms. And if you want to fully emulate the Metroid design of the armor, I would suggest you to make the visor green. And dont be afraid to reuse colors on certain areas!

On color resuing, I did make the visor the same color as the blue on the arms and legs.
As for the morphball, do you have any suggestions on what kind of shading I should use?

There's not so much problems with the shading, it could only use slight reworking. Here's what you can use (I just made a slight edit) http://img651.imageshack.us/img651/...../ballshape.png
Just slap on that red rotating Y part on it and there you go.

Looks a lot better. Thanks!
Any other things that need fixing?

Hmmm, you might give the Saber different color variations just for fun, like Samus' beams-cyan blue for Ice, purple for Wave, yellow or red for Plasma etc......

I actualy did that in Model Z-F's V.3, never got to sheeting them though.