Our image names all have the unique set number and image number (example 257-103.jpg) which is self-referential back to our 2257 records. That way, even if someone swipes our images or an affiliate uses them on his own gallery, we still have a reference to the records for that content.

Of course, we lose the opportunity to use names that are SEO friendly, but frankly, we would rather make it easier on ourselves as far as recordkeeping. What we should do (but haven't) is take the images that make up the background of the page for the TGP and make them more SEO friendly.