Looks good, but needs work
It's nice to look at, but I think some body parts of the body are not proportional. I saw the picture you based this off of (I assume you did since google has it as one of the first links for master chief), and I think it was just a bit off in certain aspects in comparison of the two. Overall, I like the lighting although it looks a bit inconsistent in parts, and the environment/background looks very good.