I think my biggest gripe with this model is that there isn't enough contrast between the armor, horns, weapons, and skin colors. The whole model is kind of this uniform black, orange, red, and gray scheme and there's no real distinction between the different details and parts of the model. Additionally, and this is more of a lore gripe, but Skarbrand shouldn't have wings. At least not ones as perfectly preserved as those on this model. It is a big part of his fluff, and his rules (he can't fly in the game AFAIK).
All that criticism aside, it is beautifully painted for what it is. The OSL is excellent and the lava effect on the axe is beyond cool. There's just not enough contrast on the model, in my opinion. But still, it's very, very well-done.