If you want to learn how to draw Majin Boo from Dragon Ball Z, watch thid drawing tutorial carefully and practice it couple of times.
To start, draw out the outline of his big, round, puffy face. Sketch the guidelines of his wide shoulders covered with clothes tied around his neck.
When done with outlining, paint the figure with colors that we have used in this drawing. In the background, add dark blue color all over and then airbrush. You should have something very close to the picture in this video, right? And that is how to draw Majin Boo from Dragon Ball Z.