Hi cutie, I am Comic black rainbow. Sometimes when you want to draw pictures in class or at the office, there is no ink or Digitizer. Can't you draw a picture? In fact, you just need a pen and a piece of paper, remember several principles, you can draw at any time and anywhere with a pen!
Before explaining how to draw a picture of three-dimensionality. Let me introduce three kinds of drawing ways that you just need a pen!!!