1. Avatars need to stay 100x100 or smaller to keep transparency without any extensions, if the file gets resized at all it will lose the transparency
2. Ideally, the smaller the better. In my opinion anything larger than 600x600 won't look good at all resized down to 100x100. The site honestly does a pretty good job resizing automatically, but the closer you get to having the original file 100x100, the better it's gonna look small
3. From what I can tell, there is no "too large" of a file for the site. I have an extension and it tells me the largest size I can upload is either 150x100 pixels, or 253.9 KB, but the site might just resize anything larger than that rather than deny the upload.
Ps. I can't say anything for certain for when you link an image address rather than upload from your computer! Hope this answered your questions
This helps out alot, thanks much! I'm gonna write this down so I can look back on it and make my own avatars to actually look good.
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