First of all, each school has different requirements for decorative painting, but in Beijing, it is generally the school that gives a proposition and creates it by itself. Of course, the style of decorative painting is clearly defined, and you can play it at will, but it must meet the requirements of the topic. What's more, decorative paintings need to pay special attention to the fact that the color must be uniform, because pigments are generally oily, so it is impossible to be uniform. It is suggested that the pigment should not be adjusted too much or degummed in advance.