Gestures drawn in 10 minutes using willow and compressed charcoal
You captured the action of the pose well! Feet could be larger though.
Nice integration of soft and sharp marks. Shift the direction of your marks to move across the forms and enhance the volumes.
Give more emphasis to landmarks and bone structure.
Nicest activity, aorlik, most nicest performance on your 600 second (10 minute) delineation. Yet, I've got one most too smallest piece of advice: Why don't you do one more 599 second( 9 minute, 59 second) sketch piece of your figure study, pleaaaaase? The reason why you'll do that sketch, is so, that 599 sec sketch will have the same humor and feel, only with a too lightest undersketch in it. Hope you'll find it an extremely beneficial tip and trick on your next drawing.