Rough Day for Snape - WIP

After seeing Order of the Phoenix, I've become a fan of the Harry Potter series, and particularly of Snape. In searching for fanart of Snape, I found way too many shiney bishonen/bisienen versions of him, so I decided to try my hand at drawing him in his days as a Hogwarts student as best I could using quoted descriptions of him from the books (I hadn't actually read any of them at the time). This is the result. It still needs a background and I'm not sure if his hair looks greasy enough, but I though it turned out well enough to share.