well, you asked me for a critique, but seeing as how I don't have a premium membership, I'll just post it as a comment. okee dokee, here we go.
What I like about this picture is the lighting effects on their clothes and faces, plus the bit of perspective you used in the room... I never got around to seeing Alice in Wonderland, but the idea of using the Queen of Hearts throne room is pretty briliant seeing as how Harry is a psyco and decorated his room in red, much like the QoH would probably do. Plus you didn't put too much detail into the background making the eye fall upon the sharper/clearer images in the foreground. And I like how you made the tile become more and more faded the farther away it got, though that might not have been intentional, but it's probably very hard to make little squares with water colors... but anyways, wether you ment to or not, it was a nice touch. "An' that's all I hafta say 'bout that..." nice picture.