Could you post a spinny of that head?
I love what I see there.
I'm working on something for Zalmoxis right now.
Posting it later though, when its ready to be criticized.
''The second industrial revolution has yet to be fully experienced by 17% of the world as nearly 1.3 billion people still lack access to electricity.''
self-portrait, all pentool (sorry about the slightly blurry image quality, I took it from facebook because I'm too lazy to upload it to a proper image storage site)
You could try shading within the plates to make them less flat, like highlight the middles so they look like they have curvature. Kinda like what you did to the back plates, but a lot more extensive.