...Is that a Jack Skellington face on his chair? Neat!
Everytime I see this picture, I think this is what the Hatter from the McGee games looked like before the corruption of Wonderland; you captured the facial features exceptionally well, and the background of gears, as well as the color scheme, create an air of forboding, as if the Hatter is right on the verge of becoming the monster he is in the games, but not QUITE there yet.
The Dormouse is a nice touch, too.
Overall impression: rather wonderful!