great work! only crit would be that his exoskeleton's surface properties don't seem to match the movie char's too well. a darker color map with a jacked up spec for that slimy kinda feelin would work well on him.
Used a few programs. 3ds max - for the base model Zbrush - To sculpt forms and detail 3ds max - To create the final low poly and unwrap it Xnormal- To bake normal maps Photoshop - To create colour/specular maps 3ds max - to render the final thing