Ask all you want, but if the person who has posted
the images on the site do not listen to your
request, you have little recourse. Sure you can
contact the service provider, but if they do not
do anything, what are you going to do then? I’d
ask nicely and let the chips fall where they may.
You’ve already got a reputation in the community,
people will trust you more than seeing the same
image on another site if and when you sell it.