A young woman seated on a box seen from posterior. In this image, I liked how she was draped in a cloth around her waist.
Very good like the last picture I critiqued. Again you use the gray paper as your middle ground and white for highlights. It all works just fine. Look through the Line-of-Action photos to see what you can find to draw. I can not tell about the hands or feet because you can not see them. Get busy drawing more. Your photography background will aid you in your drawings. Also, you might check your area to see if there are any life drawing sessions that you attend. Any and all practice will only help in the short & long run.