If you want to draw a good work, you must first learn to "grasp" and express "dynamic lines". Dynamic line is the main line to express action characteristics in human body. The dynamic line is generally manifested in the large volume change relationship of human motion.

When the figure is on the side, the dynamic line is often reflected on one side of the outer contour; When the figure is in front, the dynamic lines will highlight the changes of the spine and limbs. For drawing dynamic sketch, it is very important to grasp dynamic lines.

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