Hi Perfecto. Take a look at your curves for the arms, they're snapping. The torso also seems a bit stiff. When you walk, your hips angle forwards, and upwards (think about looking at someone from above as they walk in the direction you're facing) in the direction of the leg that's forward, and your shoulders counter-act this.
Take a look at the drawing I've made to illustrate this. The pictures on the left show (from top to bottom) the left-foot contact, the passing, and the right-foot contact. The left column shows what it should look like from above, and the right column, what it should look like from the front.
Looking good, keep going!
Imagination is more important than knowledge.