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Fantastic, and furthermore, it's a very great quick sketch, SINE! Great job on those hand quick sketches!! Unbelievably good.

Again, if I was to give you a totally and completely honest suggestion, it would be that I just can't get enough animation of those gesture gestures. Why don't you please liven up those drawings thru 148 minutes of 20 second practice pictures of hands and feet??? (148 x 60/20, 8880/20=444 quick sketches of hands and feet)

The reason why is because, it can and will help you out on making your basic knowledge of rendering even more livelier and animated in your hands and feet.

I really feel you'll be ok with your warm-ups being a bit to scribbly and sloppiest.

And with that in mind, you'll be able to fairly and completely loosen yourself up with my advice.
But in the meantime, please check out this video from Proko, about sketching and drawing Reilly rhythms.

Good luck with your future pratices and studies of these things!

Hey for a beginner, it's amazing how easy you got the main proportions and the shape of the palm.
Keep it up and you will go far, you have a very good eye.