Looks sick!
Love the coloring, but the thing that bothers me the most is; his head.
The details and the armor in itself is superb.
But, it seems like you drew the head-gear first, THEN drew in the face. This causes the facial proportions to be way off. The eyes are simply too far apart. It mostly his right eye, if you selected it and just moved it an inch to the right, it would make more sense.