Rpk,
Presentation makes art. Make sure that you rotate your work so that when someone looks at your illustration, we see from the viewpoint you draw. This can be a put off for some not to critique or even look at your work. How much you care is the height of how much someone else will care for your drawings.
A few of these gestures feel pleasant, fluid, and dynamic for just a few lines. As to the drawings themselves, my main suggestion would be only to draw one gesture on a page. Or, if you are digitally drawing, you can not see any other form- giving you the appearance of a blank surface. You may want to do this because once you have more than one figure on the page, you are now in the realm of composition, meaning that you have to fit one image around the former image. It can hamper your flow, and slow down your progress.
All the best,
JCML Fine Art