Clean hands is the ultimate requirement of artistic practice. In general art, the hand represents the mind to express words. Besides the limitation of the essential physiological structure of the hand, the hand usually exists to express the mind. Only through certain skills can the hand be accurate. Clean hands mean clean strokes without too much redundancy.
Ink, but also can't appear artificial posture and axe carving images. This is the best artistic realm of "fluent heart and hand", with a pen blowing heartily, and the heart and hand are integrated into one.