nice composition, I like the lighting alot!
I too like the light and composition. I also the overall colors of the piece. Very nice.
I think of Bane from the Batman comics when i look at your diver. I feel this is the beginning of a nice comp. Want to see more story elements. I'm not sure what the creature is that he is fighting. You have a nice value structure going on. The light source is taking control of focal point though. maybe dim that down and put it's reflection in the diver's face mask. Also, just noticed that the light appears to be behind the diver. Your shadows don't agree with that. Keep this piece goin'. It's looking very fun and interesting, especially the story.
I agree - great lighting! I also really love the colours ^_^
Nice value arrangement. Strong composiion
wouldnt it be an extremely slow knife fight :P to be original, i think it has nice composition and lighting, only other opinion, is i'd push that tentacle a bit more. maybe to see what its attached to. or just variate the shape. or even make it some sort of eel creature? other than that,cool man