This illustration comes as a personal project leaded by my interest in machinery and robotics. The contrast between the regular skin and the heavy complicated metalical parts is meant to express  the relation between two aparent different things - the man and the machine, which in fact are blending together into a single piece. As for the color pallete, 

I choose to mix the basic metalic greys  and skintones with very colorful accents, in order to continue the path of contrasts - natural - artificial, grey - color.