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Nicest job on your looseness of your shapes of lights and shadows. Way to go. However, I'm not getting enough of the tones obeying the lines of action of your pose sketch. Would you like to do this tiny, littlest thing?: Take a block of graphite, shade it down on paper, cut a wedge of a plastic eraser with an X-Acto knife, and carve out the lights on your rendered pose, for the very end of your poses in your very-first-ever figure study 1 hour class, using vertically flipped poses? As a result, your perceptions of lights, shadows, and the gestalt will become the least stiffest, and the most dynamic, confident, and fluid in your drawing skill and knowledge. For most info, please pick yourself up a copy of those two Betty Edward's books, Drawing on the Artist Within, and the 4th Edition of Drawing.

Hope these things have been completely and beneficially useful.

I think drawing a very dynamic line of action first will be the go to. This is to avoid stiffness of the pose and make the drawing feel more alive.