Nice job! I'm not sure how I feel about the upper arms or the length/narrowness of the torso, but everything else looks great, especially the "hair." The feet look a little small, though maybe that's just me.
As Chro said, the little bits of red are way too much. I would advise either switching them all out for black, or replacing the orange with red, just to have a little color balance.
The build is great, and I especially like what you did with the legs. In terms of structure and design, it's great! In terms of color, not so much. I'd say get rid of as much red as you can, and use less grey in favor of black where necessary. Also, the little lime bits are too few and too obvious. I can see where you may have been going with those, but it just doesn't work here. It works for the heartlight and eyes, but that's it. For future reference, I'd say try to limit yourself as much as possible when it comes to color.
On another note, I like weapons. Especially the one with Kopaka's Phantoka wing as a blade. I did the same thing on one of my own MOCs from last year, but I haven't posted him on here yet. Other than that, good job.