The marker pen is a form of coloring. Its coloring method is similar to watercolor painting. It has rich colors, strong expressiveness, and fast drying, but does not require water. The coloring speed is fast and easy to use. The order of drawing is also shallower back deep. Its effect mainly examines the technique of using the pen. The pen should be bold, decisive, clean and full of passion. First paint a large area of ​​color, leave the highlights and highlights as white as possible, and then carry out the detailed description.