Thanks a lot of comments.
I use Zbrush best render option for most parts of scene. Frankly, I just wanted to use Zbrush for sculpting, but I couldn’t simulate feeling of Zbrush material by mentalray materials. So, I had to make it close as possible with final scene in Zbrush. Flatness problem was cause by that.
As you know, matcap materials don’t take influence of light, only shadows take. When I combined several matcap mats, light directions were mixed, so if I increase unity of light directions, I have to render scene with low contrast and no shadows. Furthermore, matcap mats light directions were 11 o’clock. Cause of that, I couldn’t set light for dramatic shadow. Those reasons, I failed to reduce some feeling of flatness. Of course, biggest reason is lack of my skill.
Here are some shots of WIP.
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