How to draw a sketch surface

First, the main point of drawing a good portrait sketch is to grasp the personality characteristics and appearance characteristics of the object. (Eight methods: Tian, You, Guo, Yong, Mu, A, Feng, Shen, etc. Tian's face is square, especially from forehead to chin, and Guo's face is square and slightly longer. These are the basic shapes that help painters grasp the faces of people. )

Secondly, calculate the basic proportion of the head. (Regarding the proportion of the five senses in the head, the rule of "three courts and five eyes" in China's traditional figure painting can be used as the basic standard of the proportion of the head. "three

"Stand" means that the three distances of a person's head from hair to eyebrows, from eyebrows to the tip of nose, and from the tip of nose to mandible are equal. "Five eyes" means that the width of the face is equal to the width of the five eyes.

Third, analyze the main points of the head structure and grasp the perspective of the head. The perspective of the head is generally divided into three types: looking up, looking down and looking up. 1. Head-up. Observing an image from a viewpoint about the same height as the middle part of the image is called head-up. Its perspective law is a three-dimensional modeling law with the same height as the viewpoint in the image, which deepens the understanding of volume. Eyebrows, eyes, mouth, nose and ears constitute human facial features, which together reflect the expression, expression and personality characteristics of human head image. In the process of sketching portraits, we should seriously study and understand the position, decent structure, expression characteristics and personality characteristics of the characters. The position and structural relationship of these five senses are not only restricted by the anatomical relationship between head bones and muscles, but also have certain independence, and show some unique changes with the changes of expressions and demeanor. In the performance of portrait sketch, we should observe and analyze the color relationship of different skin colors formed by people's skin, and its rough and delicate texture is an important factor in the formation of characters' images; To analyze the expression of eyebrows and beards, it is necessary to conform to certain growth rules; Also pay attention to the composition trend and structural characteristics of the neck; Pay attention to the position, mutual relationship and perspective relationship of shoulders. No matter how far or near, all points should be in a horizontal line. 2. Looking down, observing an image from a point higher than the image is called looking down. The perspective law is that the distances between the points in the image and the viewpoint are not equal. These points are inclined from near to far (or from front to back) and from high to low. The connecting lines of these points are diagonal lines and finally disappear at a certain point on the eye level. 3. Looking up, observing the image from a point below the image is called looking down. Its perspective rule is opposite to the overlooking rule. )