I'm so glad you like it! This idea just came to me at once when I saw the names of McGonagall and Dumbledore on your list, and I couldn't get it out of my head *g*. Then I thought, what if she doesn't like it? This is the first exchange I have ever done, so I was a bit insecure :)
I didn't do anything to disguise my identity, but I guess that it would have been easier to guess it was me if I had worked in black and white...? LOL, I was immensely flattered when you mentioned Glockgal ;P.
The picture is as traditional as can be - pens and watercolour. Would you mind very much if I sent you a hi-res scan instead of the original? I only have the one, and it's my first ever large project in watercolour; it's pretty much a milestone to me :/. It's a bit different when I know that I am making something that I am going to give away; if I don't know that in advance, I have real trouble parting with my originals. *blushes*