We've already discussed this in depth, but I can make some notes here as well. I really dig the "painting" feel this piece has, it's quite different from your usual style. It looks like you've a nice alternate style with working on the tablet, might be worth a try with a human subject, possibly an intimate pinup.
The lighting looks great, liking the aura he gets from the low sun in the background. Great detail with his teeth and muscles. All and all thoroughly satisfied with this piece. Definitely a nice change of pace.