Yeah that is awesome, but yeah... the helmet. If I were you, and from seeing most of your stuff I wish I was.. I'd make his helmet some crazy Tetsuya Nomura-style Final Fantasy helmet. Or no helmet at all... Why not make two versions?
why didnt you put the firey bowles inside the helmets and make the helmets bigger like in the concept? The Helmets glowing with fire from inside would look sick imho.
Still trying to go for the patched together look for the helmets... did a few more sketches but still leaning towards the," I don't know how to build a helmet for protection" helmet.
i would try adding a groove to the helmet where the lights are, or maybe get rid of the lights on top of the helmet altogether. They make the helmet look a little like a gecko with an open mouth