Amazing add-on ! Works right off the bat with XF1.5.
Just one question, I can't find how to remove the @ next to the username when the avatar is shown, like it is in the example picture (the dog avatar) ..
I will have to agree with Dave as well, this should be an option within the XenForo core to toggle on or off. My community really enjoyed this small refinement of the tagging system because it brings it to a personal level. Folks have emotions attached to images or avatars and simply writing a name doesn't come close to the emotions one might experience when viewing a picture.
Ask and ye shall receive. Good work.. 4 stars.. will give you five when it works with gravatars :D (Gives you something to work toward hah) . Seriously though - excellent addon, makes tagged users look so much more interesting.