Nice work! - I think I would try to work more inside out. You might want to check out this Drawing Demo by Glenn Vilppu and mimick his way of drawing. At 21:00 he explains the process of starting with a flow (as if there was a river flowing through the body), then fleshing out with volumes. So with that apporach, you're not really drawing the contours, but the contours end up as a result of the forms you draw. - This is related to the above: remember to draw through (drawing what's on the non visible side (lightly). In the drawing in the center of image 2, you'd probably want to track the arm wrapping around the torso, all the way back to the hidden shoulder. This is to make sure that everything flows together nicely and to make sure that you don't end up drawing a broken figure. Hope this helps :)