1: Knock on color: First, analyze what color is the heavy color of the painting you want to copy, such as the heavy color of the object in the painting or the heavy color of one or two pieces of cloth in the painting. Take this heavy color as the typing color, type out all the items, draw all the heavy places, have shadows, and have light and dark boundaries.
2. From heavy to light: that is, from the heavy color, the color is very flexible, and the layers of colors are paved, even if the painting is wrong, it can be directly covered with the correct color. It is forbidden to do it in one step. It is best to paint several layers of colors on the picture, which will make the picture rich and heavy. So, don't be afraid of drawing mistakes, boldly draw approximate colors, start with heavy colors, and then add them layer by layer.
3. Try to adjust the color: analyze what color is used in the painting, which is basically formed by the fixed color of the object and the environmental color. Look carefully at the inherent color of the object you are drawing and the color of the surrounding environment, and you can basically copy the close color.
PS: Actually, copying is just to master the methods of color application and composition. To cope with the exam, it is necessary to copy and skillfully use colors and sketches or write from scratch. I hope I can help you make progress at an early date. Come on!