I first categorize the pics as by file size first & keep them as a thumbnail in folder so that I can see the image without having to click it.
I like to create folders for the pics like in hardcore & softcore & seperate them like that, then have blonde section & brunette section.Thats how I can keep up with models I have.I don't like using a program for something like that cause it's just another program that I don't need running while it could degrade how my computer runs (less programs, better performance).