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Try adding this to a template (html) file:
<{$xoops_avatar}>
Or, try adding this code somewhere in a php file:
$av_img = "<img src='".XOOPS_UPLOAD_URL."/".$xoops_uname->getVar("user_avatar")."' alt='' />";
Then you can probably find someplace in the php file where it outputs the html. That's where you'd add the $av_img field.
Not much of a coder so I can't help you out too much. But I wouldn't want your question to go unaswered (don't get me started!

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