Apart from technical details, the most relevant thing during a photo shoot is the atmosphere. It allows the model to relax and to understand what I, as the photographer require her to do. I like to work with women who are concious of their bodies- dancers, for example. The best thing that can happen, is when the model understands what I want to create and is enthusiastic about it.
Some time ago I received a good piece of advice from an experienced fine art nude photographer. He told me never to use paid models, as they will treat the photo shoot as a job to do and get it over with quickly. Thats why I always cooperate with models who want to participate in an art project for free- just for the fun of creating something special.