Walking Dead Sketch

This was from almost a week ago. We had just recently finished watching the last season of Walking Dead. I find I've been drawing too many male characters and wanted a change, so Aldora suggested her favourite character Michonne. I spent about an hour getting down the proportions and the original line drawing, and about 2 hours shading. I really wanted to focus my attention on getting the right tonal values as I seem to not go far enough with past sketches. Something I'm working on.