I've had some of my art glass pics stolen, but it didn't bother me because the takers weren't passing themselves off as the creators.
Most people usually email and ask for permission.
When my trailer is built and all the documentaion is at hand, I'm going to try and figure out a way that people can't just click and copy the images.
I'm not saying that I don't want to share, I just don't want them being thieved for profit. It would be neat if you could set it up, so that when people try to do the click, copy and paste... A little window pops up and says something like, "Please contact owner for permission"... or something along those lines.