Juan, looking at your gesture Your seeing the pinch or squeeze on the right side of torso, now look for the stretching on the left side and add more of that to your gesture with a little faster stroke for drama 👍🏻

hi, I feel you being too contour focused is the fact you use the gesture line as your spine. You have to realize that gesture lines are not an anatomy representation but a depiction of movement from the pose. You can see in the reference his weight is shifting towards his left side while yours the weight is still in the middle. The best way to visualize this is to think of the body as a line and where the weight is shifting towards. An example would be if I rotate my upper body towards the right, my lower body will move towards the left even if its very subtle just to balance the pose. Every pose will have the element of balancing in it unless its intentionally unbalance (ie. falling poses or poses that the body is supported by something else). Once u discover the main gesture line, you can trying finding out the gesture lines for the other parts of the body, for this reference its the arms and the right leg. Hope this will help :)