First of all, compare the samples given to determine which color to fill in each sheet, and be sure to be careful. Next, you can draw a large piece, first outline the border, draw the border, and then fill the middle part. When you touch up the paint for the first time, you can paint it thinner and touch it up again when it is dry.

If you don't think it's good to brush it twice, you can also make it up for the third time and stack it layer by layer, so the effect will be better. After painting a color, when changing the color, rinse it with clear water first, then wipe the pigment with a paper towel and change it into another color. Be patient, don't worry, fill it out slowly.