"Window-shading" the sketched figure

Lately my figure drawing process has become window-shading. its a fast way, after a general lay in, to capture and render from head to toe. This time I didn't quite make it to the end and left the foot unfinished revealing my process. Essentially "window-shading" is an area by area method of working on the piece after the overall composition has been drawn in. Below is the one I did from the last figure drawing session at Atelier Artista.

If you'd like to join in the fun we draw from life every Wednesday night 7 - 10 pm at Atelier Artista located n the fourth floor of cSPACE!