We actually don't have this functionality in SCLogin currently. I can add an issue to our tracker for a future release.
In the meantime, here's a quick (not very tested) snippet of code you can add to /modules/mod_sclogin/helper.php. Around line 607, replace
return '<li><a href="' . $url . '"' . $target . '>' . $item->title . '</a></li>';
with
$image = $item->params->get('menu_image');
if($image)
$image = '<img src="'. JURI::root().$image .'" height="30" width="30" />';
return '<li><a href="' . $url . '"' . $target . '>' . $image . $item->title . '</a></li>';
-Melissa
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