I'd put that mostly to the pupil-less eyes and simple framing. The darker circles around the eyes make them look rounder and less emotive, and the paint on the snout makes it look thinner and more sinister. I could see blunt teeth or rounded ears working, but they'd have to be very well-executed—preserving shape language is important.
I don't think the model is too clean, really—WarCraft rarely illustrates grime and dirt to begin with. However, I suppose I could see that it's far too plain. I suppose stronger, darker highlights could help.
For blunted teeth, making them too large and wide would make them look too Disney-esque unless there were much effort put into making them jagged and disproportionate. I maintain the pupil-less eyes are the most important part. A thinner snout could help.