I usually get from you models' pictures as references or I pick them by myself according your descriptions. I decided to create an illustration of how the reference turns into the artwork to share it with you!
I don't use photo references as a base of artwork always, I also draw faces from my head, using photos only as assistance with lighting/coloring or something else I'm having troubles with. It's always easier to draw something and see a sample of it, so don't be surprised if you find a tab with "women's fit armpit" pictures, my browser search history is pretty weird, haha! From time to time I do my search requests really carefully cause I'm afraid one day I may find FBI agents knocking on my door, lol!