Find the line of action and the negative space surrounding your subject.
You will see noticeable improvements in your drawing within a relatively short period of time.
Even though we tend to use a lot of curved lines in Gesture, pay attention to the flow of your pose and create the perfect balance between your lines! I kind of liked it.
After you have identified the head, then observe how the rest of the body is flowing from there.
But these are not meant to be finished drawings.
If you are not familiar with his paintings, I strongly recommend you check them out.
You sit down, relax and make quick drawings, with quick lines.
There are many free reference libraries which you can draw from.