Let's try to break it down...
I don't like the skeleton bones being used here, he's supposed to be powerful and/or manipuiative, and lastly, ALIVE.
This Makuta doesn't look powerful(ish), doesn't seem to be a challenge to face or have enough cunning or power to manipulate others, and skeleton stuff...
That "hammer" looks awkward, I don't think you should make a hammer out of trans-blue and trans-green, especially with CCBS bones.
Needs a lot of work.
Also it would be great to have more pictures and angles, and a lot at his feet.
And the background is pretty messy.