Female life drawing can be intimidating. The idea of starring at a naked woman is taught at an early age to be wrong, but in art it is what is expected. Relax and take a deep breath. This could be the beginning of your encounters with life drawing and the models may be dressed or nude. Get comfortable with both. Your model is already comfortable with her body. Now, you need to get comfortable with looking at that same body.
Life drawing is an excellent way to familiarize the artist with the way the human body moves. This opportunity will show you the minor and major alterations that occur during movement and pose changes. Pay close attention. You will not have a static reminder, like a photo of what you were previously seeing. Your page or canvas is the only reminder you have of her previous pose. Use your eye to capture it.