We usually do not accept same artwork cropped only for the avatar. However, there is a loophole. You just keep the original (previous, uncropped) artwork as it is, and change only the preview icon to be 64x64, and then you can use it as avatar.
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We usually do not accept same artwork cropped only for the avatar. However, there is a loophole. You just keep the original (previous, uncropped) artwork as it is, and change only the preview icon to be 64x64, and then you can use it as avatar.