The concept is my own. Rampage is a genetically mutated cyborg supervillain who is the result of a botched military experiment on a US marine. He lost his right arm in a training exercise where he overestimated his strength and tried to catch a rocket-grenade. His arm was replaced with a cybernetic arm in hopes of rehabilitating him.
I sculpted the model in ZBrush and hand-painted the Colour and Specular maps in Photoshop. The Normal map was generated using xNormal. Rendered in Blender.