This looks great. Now for my mindless opinions. I couldn't help but think that a cuckoo would be a more appropriate "cutie mark" for the mad hatter, because he's mad. Then I realized that the problem with that is that EVERYONE in Wonderland is mad. Madness isn't going to be a good criteria for cutie marks with something like Alice in Wonderland. Now I'm thinking either something to do with hats, which would look weird on him because he's already wearing a hat, or a little teapot or teacup done more simplistically than shown here. Hmm... No that I look more at it, the cup sort of goes with my 'madness' idea, in that it's tipping and spilling, showing that it's "a little off" not unlike some hatters I might mention. Your way's better.
I haven't read the other comments, but I'm gonna guess out of the 27 on here when I'm typing this, a significant number mention something about your choice of coloring with Alice. I know from the description that you haven't seen the movie in a while and you made it fast, and I sympathize with that. I would just likek to say that I would've gone with some kind of pale blue for the body, something to contrast with the White Rabbit cutie mark without clashing or looking weird with the bow (maybe I'd make the bow white to offset the rabbit.) Also, as far as white on white goes, the rabbit looks ok.