Left side is starting to look awesome, right side needs some holes filled in (top right corner) and something to fill in the bottom right for composition (probably just more large rock shapes).
I would say get the face right before anything. Right now, the face update looks a lot better, you are definatly on the right track, I'm looking forward to how this turns out!
Is it possible to move the icons to the right side under the buttons rather than over them? Right now they appear right above the posters signature which seems like an odd place to put them.
It may help to pretend you're an art lead viewing your portfolio. From this perspective, you can ask yourself, "What could this person contribute to the project my team and I are working on, how does this person's work compare to the rest of the applicants, and is it cost effective / within our budget to hire this person?"…
I dunno if its something you are aware of, but is his right eye misplaced? Right now it looks as tho his right eye is looking to the direction to his right while his left eye is looking straight forward. I agree with pliang, his skin should look more scarred and dirty.