Rythm in drawing

Drawing rythm was pretty tough for me, I had to understand first "what is rythm in drawing ?". In his book Force, Michael D. Matessi helped me a little. He says :

"One line or idea is a force; two forces create rythm.(...)"

So, rythm is about contrasting lines, forces. Straights vs curves, thick vs grease, etc.
A line is a force and has a direction, contrasting directions, thickness, curves will immediatly creates, rythm, which will create emotion. Because in drawing, everything is about emotion, every drawing should tell a story, communicate feeling, life. Drawings are about capturing life and put its very essence on paper...

I'm still far away from communicating such feelings, emotions. Reaching this goal can take a life, but I really think it's worth trying. So here are my first shot :