maybe a pic or two is worth a thousand words, here's the idea:
use of proper lighting, the proper focal length lens for the task, adding some color, and accentuating the interesting parts of the girl seperates photos that sell memberships from photos that do not sell memberships.
and it ain't that tricky.
everyone read the same book about how to photograph people.
use a telephoto to give a "pleasing look."
well, what if the face is not the most interesting part of the girl?
maybe it's her ass, or her breasts, or her legs, or her fucking SHOES?
you accentuate that interesting feature getting in close and using a wide lens.
you do not shoot every image this way, but you spice photo sets up this way when it's appropriate.
