[mark0™]

Dan, that avatar is 64X64, and the byte size is below the limit, so it should work.

EDIT-Sorry, the_artist pointed out it was too big, my bad, use her new pic, its small enough

Try again, if it doesnt work, please tell what it says.

The avatar was uploaded as a .jpg file, so make sure you saved it as a .jpg and not some other format when you tried to upload it.
I think Bitmaps are acceptable too, but I think JPEG's are the best format.