I like how it's turning out so far! It's simple,yet has some elegance to it. I personally would like to see some more customizations/colors combinations, but so far it's looking great. On that subject, I do think making the metallics a tad more prominent (or placing them in such a way that would allow them to act as the accent in a muted color scheme) would help open up the coloring options.

One other thing I had a question on: Would the animation always play, or during certain actions/times? Currently, the animation looks like it could be a bit obnoxious if it's always on - most syandanas in game don't clear the base of the skull, height-wise, and this one easily clears the head - I almost feel as though (from just the size of it) it would "overpower" the rest of the frame. Even with the animation limited to intermittent, the syandana would still take up a significant amount of room

Of course, everything here's my personal opinion, and I have absolutely zero experience with modeling (or art) - so take everything I say here with a grain of salt (or three); you as the creator know what you're shooting for!