1. Sketch: Before drawing the shark skin, it is best to draw the general shape and lines on the draft paper, including the shark's body, fins, eyes, mouth and other features.

2. Coloring: After the sketch is completed, choose a good color and apply it according to the color and spots of the shark. You can learn from some shark pictures for reference.

3, detail processing: after the completion of the basic color painting, you can add some details, such as the pattern on the shark, luster and so on.