I would say, you have a great eye for the gestures, now maybe add in dots or circles for the joints, so do the gesture lines like a stick man, then add iin the joints. Stick to 30 second sketches and don't worry about the outlines of the body.
At this point you should be becoming more aware of the anatomy. So once you can get down the joints, add in the head, rib cage (like a simple egg shape) and pelvis, you can try this at 2 minutes, then 1 minute, then drop down to 30 seconds once you become more confident. Again, don't worry about the outlines of the body, just try to visualise the structure as this will give the body a strong foundation of gesture, proportion and strength.
Practice this...a lot and every time you go to a live life session.
Once you get into longer poses and can add in the muscles and skin, the strength of the gesture and underpinning will really stand out if you do this exercise FIRST. Just becasue you might have 10-15-20 minutes, don't slow down, image it's a 1/2 minute pose, quickly act capturing the gesture, joints, head and hip in proportion as otherwise you'll lose some of the energy and dynamism of the pose!
Keep up the good work!
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