This is Ali Clarke, a professional dancer that I got to work with a few years ago. She has since away to Ireland to the Netherlands to study dance full time (ballet and contemporary).
There was a noticeable different in how she posed compared to models. Little details like extending her toes, delicate and poses etc that came naturally to her as a dancer worked a treat for the photoshoot.
This was shot on a Canon 5D mk II and Canon 24-70 f2.8 L lens.