the monochromatics of the matcap are a strain the eyes, hell be zombie white with dark iron armor. the contrast should be more than enough to make the organic shapes work particularly with the lighting I have in mind. Hes a bit of an Easter egg thing, you keep looking to find new little things. I wanted to create his depth as his character is 500 feet tall.
Hell be in context against a foreground human sized character for the story aspect of the final render.
But please inform with any thoughts as 3-d is quite new to me and I'm still figuring out zbrush and its interface.