Hi gang,
I think the admins (or maybe it’s “engraved in stone” by YaBB) set the size requirements for avatars quite nicely. I tried adding mine over at Wilders, but there the limit is 60 by 60, and this one looks like hell shrunk that far. At another site (totally different software) they permit up to 100x100, and that took only a minor down-sizing of mine so it worked quite well.