starto Input for gestures? Well now that I've looked at the darker images you posted, I can definitly see your action line, but your shapes seem a bit off. I don''t know how often you look at the image, but extra observation and practice should get you improving with gestures with leaps and bounds. Just don't concentrate on the paper so much, like for a 30 second gesture, look at your paper maybe 5 times at 1 second a piece to know where your pen is, then look at the image the other 25 seconds, it should really help solidify you shapes in space. Alternatively you could try a contour drawing (I believe it's called) exercise, where you just look at the object/subject, and never look at the paper when you draw, and see what comes out. Personally for gestures I get the action line, then the main torso masses (ribcage and hips), and then add lines and main masses for the limbs and head. I'll post some pictures that I like below (I didn't do either of them), and you can see how some people do gestures, the action line is kind of lost in all the details/fill to see, but the action line often turns into a spine or center line for the torso and gets lost that way (since the trunk is important in balance).
So just remember to look at the subject a lot, and to keep proportions and shapes in check even though it's a gesture drawing, keep things loose but don't break reality (for gestures at least, you can always try playing with proportions in studies for fun, like with characitures).
I don't know if that was the kind of input you wanted, I might've just rambled on, but it's too early in the morning to tell.