it's been a while since I posted here.
This is my last exercise after understanding some little things about digital painting and the problem is that the rendering made by brush, it's not that pictorial but seems like plastic.
It's Photoshop CS6 and I use a standard round brush with opacity and flow set on 100% and on brush settings -> transport, opacity variation set on pen pressure and flow variation disabled.
Why is that happening? How can get a pictorial effect?