Final effect:
1. Now I start to draw a "Gaara" for the big mouse, because I don't have a tablet. Drawing drafts is more troublesome. I compose the painting directly on PS. Friends with art skills can practice drinking more to get familiar with it. If it really doesn't work, just type out a rough draft on paper and then scan it up.
2. Roughly outline the outline shape.
3. Start coloring your hair, paying attention to the light and dark levels.
4. Color them one by one: hair, face, clothes. It is recommended to color in separate areas. For example, I create a layer for my hair and a new layer for my clothes. This makes it less confusing and helps with revisions.
5. Use the burn and dodge tools to process the dark parts and highlights of the character, and control the intensity.