Well...
The black lines are to thick
The shoulderpad lacks shading
The boots and fur ar CnP
The face is blurry
The horns are blurry
The trousers are to plain
Pure white on a skin looks bad
The axe looks pure black and pure white
The skin itself lacks shading
The ice looks bad (Is that ice?)
No use of the skin's original teamcolour
The skin appears to get darker as it goes up, think about perspective!
The axe's handle looks good, except the upper half lacks proper shading
Also, I thought Ner Zhul was the guy who got frozen...
He used to be an orc shaman...