Actually, I figured out how not to resize avatars.
In previous code modification for /components/com_jcomments/tpl/default/tpl_comment.php
Replace
<?php
$database = & JFactory::getDBO();
$jcommentaarid = $comment->userid;
$sql = "SELECT avatar FROM #__comprofiler WHERE user_id= {$jcommentaarid}";
$database->setQuery( $sql );
$avatarmut = $database->loadResult();
?>
<div class="comment-avatar"><img src="images/comprofiler/tn<?php echo $avatarmut; ?>" title="<?php echo $avatarmut; ?>" width="36" height="36"/></div>
with:
<?php
$database = & JFactory::getDBO();
$jcommentaarid = $comment->userid;
$sql = "SELECT avatar FROM #__comprofiler WHERE user_id= {$jcommentaarid}";
$database->setQuery( $sql );
$avatarmut = $database->loadResult();
?>
<div class="comment-avatar"><img src="images/comprofiler/tn<?php echo $avatarmut; ?>" title="<?php echo $avatarmut; ?>/></div>
and in /components/com_jcomments/tpl/default/style.css
search for:
/* Avatar */
#comments .comment-avatar img {width: 32px;border: none !important;}
replace with:
/* Avatar */
#comments .comment-avatar img { resize:none; width: auto; height: auto; border: none !important;}