The concept: Poseidon (the little fish up top) is an explorer sent from Atlantis, which is populated with hyper-intelligent fish, to explore the surface. Because of the pressure difference (and obvious lack of water), he has to use his mech, Neptune Mk. II, to safely map the terrestrial world.
(The arms aren't messed up, they're supposed to inflate as ballast to get him to the surface.)
I'm mostly looking for feedback on places where I could cut down on the poly count without sacrificing detail, but as I am a student, any critique at all would be great.