Halo Elite Speedpainting

Speedpainting with wacom bamboo tablet and Photoshop CS5. Drawing something that you love always motivates you to finish. Yes, it's pretty messy, but this is my second photoshop painting and I'm trying to get better every day.

Elite from the Halo Series by Bungie.
Approx: 3 hrs off and on

Comments are greatly appreciated! If you have any knowledge you'd like to share, please - any tips or critiques on the composition, value, pose is great!