The avatar file size of 64KB too small for you? Me too. But I can't do anything about it. I have, however, found a work around.
When on the avatar selection page, you'll see a section called "Link to off-site avatar". Do that and you can link an avatar of any file size.
When on the avatar selection page, you'll see a section called "Link to off-site avatar". Do that and you can link an avatar of any file size.