I  recently put the wrong pictures on a listing (HP computer- wrong color for that model) and could not change it.  While I understand keeping it safe for buyers not to be scammed, in the case like mine, I think the pictures should be replaced rather than added to - with a notice to any bidders and allowing them to be notified of the change and an option to tetract their winning bid.  That would seem to me to be in the best interest of the buyer AND the SELLER.  What say you?