ZBrushCentral

Looking for Feedback on Troll Model

I just completed a model of a troll in zbrush 4.0 and I’m looking for feedback.

After looking through the gallery a bit, I realized that my models never look quite as realistically shaded as the ones on there.
Just wondering what people think about it. What I’ve done right, what I’ve done wrong, how it could be imroved…