Done as part of a practice session with poses of 60 seconds in length.
Your lines are confident and you have captured the overall form as well as light and shadow, perhaps you could exaggerate the darker shadows a little more but for a quick sketch I think you captured the essence well
Thank you for your feed back, I find I am out of time; I have not done much investigation into value. I add that to my list :-)
Very cool! I especially like the bottom left :)
Thanks, I like that one as well.