Women Posing Mistake #1 – Neck creases
The Fix – It doesn’t matter how thin or not thin a woman is. It doesn’t matter how old or not old she is. If her body is turned away from you and she is turning her head to look over her shoulder at you, it is very likely she will have a nice set of neck creases.
Neck creases/wrinkles may not bother some photographers, but they bother me, and they will most likely bother your client. There are a couple easy fixes. You can 1) tell her to turn her upper body and shoulder (the one closest to you) more towards you so that it opens up that area and minimizes the creases, 2) adjust your shooting position more to the side of her, rather than directly behind her so that she doesn’t have to crank her head so far to see your camera, or 3) use her hair to strategically hide the creases.
From http://www.iheartfaces.com