umm you mean the image of the item when the user receives it? Sure its doable and should be relatively simple to accomplish. If you have installed the script, find this line in levelup.php:
PHP Code:
$dropstatus = "<br>Congratulations, you have acquired an item {$actualitem} by clicking this adoptable.";
Replace by:
PHP Code:
$dropstatus = "<br>Congratulations, you have acquired an item {$newitem->itemname} by clicking this adoptable.<br><img src='{$newitem->imageurl}'>";