looks pretty cool, you could use the extract function in zbrush to make the metal inside his face, then paint all the ripped skin and blood around the edges!!. Is this an edit of the z-brush demo head or did you model the base mesh yourself?.
Looks good. Without there being too much detail (hair eyes etc) yet there's a definate likeness. I can't really crit too much as yet. [Link to www.3dprevis.com]
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