Try to compare as much as possible, such as light and dark contrast, virtual and real contrast. Spatial relations, primary and secondary relations, and cold and warm relations should also be clear.
The result of weak contrast between light and dark is that the picture is gray. The solution is to brighten the brightest part of the picture as much as possible, keep the brightness of the bright part and the gray part appropriate, and then deepen the darkest part of the picture as much as possible, and then there are sub-dark and sub-dark ... (These are generally near the dividing line between light and dark), and the reflective part can neither be too bright (darker than the gray part) nor too dark. If it is too bright, the picture will be messy and colorful. If it is too dark, the dark part will be opaque, airtight, hard, greasy and empty.
Sometimes the contrast between light and dark is open, but it is not opened according to the three parts of light, dark and gray. There are dark colors in the light and bright spots in the dark. In this case, the picture is loud, but it is messy and colorful. In fact, no matter how you shape it, you can't surpass its bright, dark and gray roles in light and shade.
The contrast between reality and reality is weak, so it is difficult to get through the spatial relationship, primary and secondary relationship and performance texture. Generally speaking, the main reality is weak, near reality is far weak, square reality is round and weak, hard reality is weak. If it is blindly real or virtual, it will make the spatial relationship unclear and the texture unclear. In addition, blindly will make the image stiff; Blindly pursuing the effect of relaxation is empty everywhere, and it is easy to make the picture empty.
Sometimes, the boundaries of virtual places are not clear, but "virtual" is not vague or ambiguous. The expression of big loss can only be understood, but not expressed in words. There are many things in art that can't be said, so we should read more template paintings and experience them with our hearts.
Some students think they want to brighten it up as soon as they mention it; Speaking of reality, I think I want to paint it as dark. In fact, bright places can also be painted solid, and dark places can also be painted virtual. Virtual reality and light and shade are different concepts. Generally speaking, virtual reality is in terms of turning points. Sensually speaking, this is a question of the clarity of the turning line, whether to punch holes. Light and shade are expressed by the depth of color in painting. Of course, the turning line is also deep, but that's not true.
"Accurate structure" is always the basic requirement of the picture. Although there is a popular saying that sketch is divided into structure sketch and tone sketch, this statement is not scientific, it is just a habitual title, not a professional division method. Because structure is also a key thing in timbre sketch. For an object, the light and shade will change with the change of light, but the structure will not change because of light. Therefore, light and shade are only means of expression, and structure is the key. Without light and shade, the atmosphere and effect of the picture may be difficult to express, but without structure, there is nothing.
We must draw pictures with understanding. Of course, plastic surgery is to find the right position through auxiliary lines. Know how to turn complex relationships into simple things, such as heads. We can not look at it so complicated, but look at it as a simple geometry-a sphere, and then slowly describe the changes on it with auxiliary lines. With regard to dark tones, we must first understand the levels of light and shade, where is the gray surface, where is the intersection of light and shade, where is the reflective surface, and what is the distribution and relationship between them ... First solve the problem of understanding, and then how to express it, that is, how to draw ... Many questions, directly ask the teacher who taught you how to draw, draw light and shade next time, observe carefully, think clearly before drawing, and try.