Just doing the measuring, erasing, and reapplying charcoal took me 135 minutes. Am I slow or what ha ha. I will start over and do this again. Practice, using angles, areas that line up, such as the nose with the back of the right heel, using head length to measure portions of the body, and the envelope (the lines enclosing the figure) all contribute to being able to see better the proportions of the figure or any subject, for that matter. By using the envelope one can check positioning and negative spaces.
The reference photo used is from the Wet Canvas Figure Workshop 4. The goal is to get a fairly accurate line drawing then do the modeling of the figure - all within an hour or so. I have lots and lots of practice to do before I can do this within an hour. The great thing is I get so lost in the effort that time just flies by.