First of all, let me say that I love your clean lines. The anatomy is just right, the pose of it's head, the background and the look in the wolf's eye gives it a lot of character. I adore the shading, it gives it just the right amount of fluffiness. The simple background puts your focus on the wolf (which is a good thing). Overall, the colours of this picture put you in a Winter-like scene. Personally, I imagined the landscape of snowy plains and great glaciers with roaming wolf packs.
I haven't taken a look at the other contest entries, but I really hope you win it. Your precision is incredible and you are an excellent artist.