First, lines start from dots and arcs, then cubes and semicircles, and then cubes can express spatial relations with parallel lines. Then there is a straight line, the position of the five senses, and some perspective, which must be clear to the chest. Then start drawing eyes. You can copy others' first.

Second, perspective, the human body has learned to understand perspective, and then we can skillfully show the required structural position by looking for some angles and start drawing the human body. When you start drawing a human body, you can practice some simple structures first.

Third, draw more lines and copy other people's paintings. This is an exercise. Except for the initial practice of perspective, other exercises are actually the same, that is, drawing more and copying more.