First of all, sketch is the foundation of professional art, and any kind of painting should be based on sketch. I don't know how old you are now, and I don't feel much, and whether you take sketching as a hobby or as a prerequisite for your future career development. If it is the latter, I can go on. Generally, I began to contact sketch from junior high school. Sketching is a long-term accumulation process, that is, it depends on hard work and your talent.

The preliminary sketch of 1 is to practice lines, and lines are very particular, because the sketch effect is composed of lines.

Began to contact with the most elementary gypsum geometric objects, which are the basic graphics of all objects in nature, such as circles, vertebrae, cubes and so on.

Get in touch with real still life slowly, such as fruits, vegetables and jars.

Contact with plaster head figures, such as David, Marseillaise Warriors, Agriba, etc.

5 began to change from a rigid plaster portrait to a real human head. Copy the works that you can get in the early stage slowly. Later, you can find a model to sketch, and then you can write them silently.

I have given you a general introduction above. I am a sketch student. I began to learn sketch from junior high school, with a foundation of 10 years.

Sketch first pays attention to the accuracy of the type, not to mention what type, and then the relationship between light and shade. Sketch wants to express the true three-dimensional sense on a piece of paper, which is the relationship between light and shade. The sketch term is tone. A painting always has a relationship of black, white and gray.

Sketch is a professional art, and you can't get started by buying books. If you like it very much, you can go to a famous art class to get in touch with it. Buying books can only be used as a reference, and it can't fundamentally solve the problem, because the hand is your own. Everything depends on painting more, practicing more, finding more feelings and observing things around you.