Creative progress

As stated in my research PDF, I'm looking to capture the human form with minimum lines. Have started to look at subjects. Have alighted on break dancers in mid break. It's a subject I've studied before, and one I like. The initial sketches below are just to expose my eye to the forms I'll be capturing. Next step will be to start to strip them back to see which lines can be lost with minimal impact on the movement and weight of the pose. I'd welcome any general feedback, and specifically of the following poses work best, and any marks that you see as especially helpful or unhelpful.