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The html output from the avatar tag comes from the plugin's resource file. If you open plugins/userimages/inc/userimages.resources.php on line 9 you find this:

$R['userimg_img'] = '<img src="{$src}" alt="{$alt}" class="userimg {$class}" />';

That is where it comes from. In your case of modifying the size of the avatar you would use this css

#useravatar img.avatar {
	width:45px;
	height:45px;
}