That's weird. The picture size on both of yours seems fine. The hats I used for each of yours I used in other ones as well, and they worked fine. I saved them all using the same method, and they should all be fine.
I did go out to the web and find different pictures for each of yours, because the sizes of your avatars wasn't conducive to a good end product, but I did that for other people as well and I see theirs working.
Hard to say. I guess if there are any other problems I'll tinker with the pictures until they work. It's not hard and I don't mind.