Nice! It looks like the model may have moved a little in this one. I say that because of the position of her left arm (humerus).
I'm curious, when you start out on fresh paper, what's the first thing you do, the first sort of mark you make? There's no "right" way, I think. I generally just scribble around, trying to see the entire figure, then move into the dark masses. Then I finish up with lines. Some go straight to the dark masses and their drawings look a little like reverse negatives at first. Others carefully draw light outlines first and fill in the dark masses later. Some use erasers and some eschew them (I didn't carry one in my box for two years, but use one sparingly now).