Last but not least, the simple single outline of the stroke. What the lightness and liveliness when the single stroke describes the forum, it looks very easy, but if you're a beginner, it will give you a hard time. Help yourself out with some light outlines on the paper before practice the movement of the hand. And after that, apply the outline. For this I have used soft pencil like six p and sharpen with the art knife. The hand is in the air for more flexibility.

This method allows both to make an accurate outline, if you're a good observer and throwing practitioner or to give just the idea of the forum, so to speak, more freely interpretation of the forum. This is the simplicity of the single line.