Wow! I really love the style in this one. The style reminds me of something, but I can't place a name on it yet. While I'm not a fan of Fenrir, I do like how you drew him here. I could almost say he's sexy. I see Harry is really enjoying himself! XD I just love the expression on his face.
I also love the fact Hermione's leg is stretched out beyond the "canvas." And the occasional colors add a very nice touch to the overall feel.