Oh, wow. This looks great! I really like your new method of colouring hair (how did you do it, by the way? I don't use markers but I want to see if I could possibly adapt this new method so that it could work with coloured pencils).

The shading on his clothing is also very good too -- and of course, no picture of Snape is complete is Snape does not have a suitably frostly glare. ;)

I just want to say that I know the background is supposed to be a gradient of Slytherin colours -- but after a moment my mind got the idea that Snape culd be standing in a field somewhere with a grey sky. Maybe my mind's just making things up, but that's what I saw. Great work Jateshi -- this looks really good!