Whats up man, this this is so cool, I like the head and the color scheme. This is very good. I've got a new group and I'm gathering the best mech builders to hold a contest, and I'd like for you to join. heres a link http://mocpages.com/group.php/13081.
This is great for a first mech. The legs have a good shape and it was a good idea using minifig arms as fingers. It has good flexibility for a mech not made with t-bars. I do think the proportions need work though, I think it one of the harder things to get right on a mech. All in all I say awesome job!