I differentiate between porn/celebrity/softcore already, by directory. That's primarily for storage reasons. I'm not willing to really get extensive here, so my differentiation is always going to be by directory. I'll think about adding sub-directories for major ethnicity, but even that little bit that would be a big job considering how many packs I've got out there. Hair color and other 'tags' simply aren't going to happen, at least by me - too many sub-directories quickly gets cumbersome for everyone involved.
In the meantime, Google is your friend. Pictures of every girl in my packs are readily available simply by typing in her name. If it's a porn girl, an even better search would be iafd.com, as I get the 'official' spelling of every girl's name from that site.
Lately, I see people asking for better organization so they can find their fetishes without effort. If that's a sign more people are finding the game, then great! Perhaps one of the new people could index the packs and keep the list up to date, including tags for hair color, ethnicity and the like.
After all, if that's what you want, maybe you can help make it happen.