These are very nice. You have a pretty good sense of proportion and can draw the body well. However for a gesture they are almost too well put together, in my very humble opinion. Gestures are about getting a sense of the dynamic or the action of the pose as well as loosening up the artist rather than getting a good drawing. They can be as messy as you like and they can look like nothing but scribbles.
In a gesture you also want to allow the lines to follow the form as much or more than the outline of the form, so you'll see a lot of lines moving through the body showing how it curves.
I've attached a good gesture example below. When I'm doing a gesture I mostly leave my pen or pencil on the pad touching the paper through the whole thing.
Gestures are fun and crazy, so there's really no way to get them wrong. Try letting yourself scribble them out with a sense of action behind the pose.