The maximum size of your image has to be 64x64 pixels. If it's bigger, it'll resize itself. If animated too, the animation won't work.
It must be the size of this block or smaller:
[IMG]http://img245.**************/img245/1313/avatarsizeah0.png[/IMG]
Can you post the image here? I'll resize it for you.
-Squiddy22
