① In the process of representing objects, line sketch uses simple lines to represent the morphological transition, changing movement and texture of objects from the perspective of structure. It should have the characteristics of rigorous modeling, natural and vivid modeling, proper use of lines and good overall effect. It expresses the primary and secondary relationship and spatial relationship through the thickness of lines and the change of reality. (2) Sketch based on the combination of line and surface. Line-based, line-surface combined sketch expression can give full play to the characteristics of sketch in sketch, especially in the long-term art college entrance examination training in class, which is also a common expression method in sketch training at present. Through the supplementary addition of some light and dark dividing lines, dark parts and clothing lines, the object is characterized by rich levels and strong expressive force. The use of lines ① The interpenetration of lines shows the interpenetration and echo relationship between lines, which is an important factor to make the picture full of rhythm. At the same time, the interpenetration, echo and perspective of lines play an important role in expressing the sense of space and hierarchy of objects. The interweaving of lines in different directions gives people different sense of direction, which can directly show the perspective direction of objects. However, sketch is different from line drawing. If every depiction pays attention to clothing lines like line drawing, then the interspersed echoes between lines will lose the rhythm and smooth charm of sketch. In the sketch training of line selection and refining, after the basic shape is determined, we should pay attention to the following points: "Clothing lines" should avoid parallelism, pay attention to density contrast and reflect the structure. The "structural line" should be accurate, the skin should be solid and the line should be accurate. Don't draw too much, and don't draw too much. ③ Comparison of lines in sketch, through which we can find out whether the proportion and perspective of objects are correct. On the premise of emphasizing the accuracy of proportion, dynamics and perspective of characters, sketch usually uses and emphasizes the arrangement methods of lines: straightness comparison of lines, brightness comparison of lines, reality comparison of lines, length comparison of lines, density comparison of lines and thickness comparison of lines. ④ The purpose of structure sketch is to cultivate correct observation methods and strict modeling ability. A sketch artist must have a solid and skilled knowledge of human anatomy in order to be able to sketch with ease. The internal structure of the human body has not changed, but only with the dynamics of human movement and clothing patterns. Therefore, the use of lines is closely related to the structure, and the expression method should serve the expression structure. The Basic Methods and Steps of write slowly Portrait In the training of write slowly Portrait, in order to better represent the characters, we can draw a small portrait of the characters at a stage before drawing write slowly. Portraits don't have to be too big, 10 cm is enough, and sketch training with hands and feet separated is needed. Because the head and hands are very important parts in the sketch, we should focus on depicting them. (1) overall observation, be familiar with the overall observation of objects, master the shape, proportion and motion characteristics of objects, and analyze and study the objects of sensation from these basic points. After the initial brewing is mature, the general effect of the picture should appear in your mind, and this reaction is very quick. We might as well call it "having a plan." 2 composition layout. According to the selected angle, the sketch objects are arranged in the appropriate position of the frame. Dynamically draw objects at a large scale. (2) Put pen to paper gently in the picture on the left, proceed from the whole, quickly determine the big basic shape of long straight line or long arc, and grasp the proportional relationship and perspective relationship of big shape. After mastering the basic modeling, further check whether the picture needs further adjustment, push the picture far away, and check whether the proportion, dynamics and perspective of the modeling are accurate as a whole. In sketch, inspection, adjustment and modification should run through. It can be said that the painting process is a process of constant adjustment, modification and perfection. (4) The local affirmation is based on the determination of the basic shape, and the shape is shaped from the local. Generally, the five senses of the object are drawn from the head, and the hand, body outline and clothing line of the object are further drawn from top to bottom. Pay attention to the perspective direction of hands and feet here, and don't draw your hair too early. We should pay attention to several contrast changes in the treatment of clothing lines, namely, light and dark contrast, virtual and real contrast, thickness contrast, straightness contrast, length contrast and density contrast. When depicting the head, shoulders, hands and feet, we should pay attention to their internal structural relations. There is also the need to pay attention to the training of quantity. Draw a certain number of sketches every day. I hope you can learn sketch well and get into your ideal school.