Not bad! The model will really shine in what you do with the texturing of it. Will it be clean or beaten up a bit (scratches and rust and paint chips and dents). The head could be a bit more robot like rather than so humanoid, just as with the arms, they could be less "lost in space". I like the legs, maybe look at that and make it work over the arms and the face too.
Also when creating a robot it doesnt always have to follow typical structures. So with this its following the human structure, arms where arms are and legs and head all where you would expact them to be. Look at insects and crabs, they have an interesting variety of structures to mix up with human stuctures and other animals for great and original results.