It's pretty nice for what it is, but honestly it isn't much.
I've been noticing a bit of a pttern with your work. None of it is bad, but I think you need to extend your bounds, and I know you've been told this a few times. Larger pieces would be nice, but I don't think it's necessary. Try more defined forms, something more realistic, maybe. Most of your submissions include 'blob' characters, and personally, probably won't help you as much as if you challenged yourself to try something different. You're not going to learn or improve much anyway if you don't get a little out of your comfort zone sometimes.
Sorry, I'm taking this out of the challenge. The rules clearly state that: "Preview image must be exactly 64 x 64."