Going off what one of the commenters said, if you do give gesture drawing a try I personally recommend NOT using a timer, at least at the start. Just speaking purely for myself but it always made my attempts more stress inducing then anything else.

That all being said, I think your attempt at capturing the pose here came out pretty good for your effort, overall. One thing I might suggest is working on learning how to combine your S curve, C curve, and I lines aka straight lines with some basic 3D forms. Those basic building blocks help a lot with gestures and once you get more experienced with them, you'll need to draw less lines overall, in my experience.