Immediately what I'm noticing is repeated lines, I suggest you do the best and try to avoid that. This is why I avoid doing gesture sketching digitally, as I personally tend to undo strokes a lot and it breaks the momentum. Use "S" curves to move along the line of action while "C" curves usually indicate points where the gesture slows down. Usually the intersection of the "S" and "C" curve creates a "T" which often stop the audience's gaze to a halt. Gesture is all about visual momentum, so don't worry about accuracy. I'm not sure if I just said made any sense but if it did, hope it helped. I have yet to upload any of my work on here, thought I'd browse through and see what others are doing. Kudos for doing so many gesture sketches though!