Looks cool, but I'm seeing a few small issues. Avatars here need to be 64x64 (just the thumbnail preview, called the "small file" when uploading) and this has a preview of 80x80. The larger image you've uploaded seems to be scaled up from 80x80 to 100x100. If you increase the dimensions of pixel art it needs to be an exact multiple of the original dimensions or the image will be distorted. Also, the small thumbnail has a couple of pixels on the left edge that don't match the background color.
@ tanuki, I know that, I just confuse the preview with pixel art.