Hi Alyce,
Its not something limited to models, I know several people on Facebook who have had all of their images stolen and made into a fake profile - and not just girls either.
Its one of those wars that isn't likely to be won, because technology works against you.
When you view a webpage, a lot of the information (images, javascript, flash content etc) is saved on your computer in the "cache" folder. This means that if websites were to use the "no-right-click" trick, the images can still be grabbed from the cache anyway, or from looking in the pages source code, and the "no-right-click" trick is a bit of a poor one as its still very easy to use the right click button.
There are a few other ways of attempting to protect images, I believe there was a script out there that would clear the page viewers paste bin every time they viewed a page, but that's not very member/viewer-friendly.
Its also possible to make the photo the background of a "div" element, which makes it harder in certain browsers to find the photo as you would have to go through the source code.
We have recently updated the gallery to make it harder for people to steal images, in the hope that anyone attempting to will get bored of the long process it would take to get the images, but as I said above - its a war that isn't likely to be won.
So unfortunately, as you said, theres very little that can be done apart from reporting those profiles as and when they pop up.
Might also be worth checking out this website:
tineye.com - I've used it on a few occasions and found stolen photos through there. Its only drawback is that its only indexed a tiny part of the web so far as its quite new.
James