The operational definition of sketch: using a relatively single color to express the painting method of the object with the help of lightness change. Sketch painting tools are varied and not limited to one tool. Sketch is a relatively fast sketch form. Sketch level is one of the important indicators reflecting the basic level of painting and basic modeling ability of painters.
Sketch is an important foundation of realistic painting, and it is also the most restrained art that needs the assistance of reason. Generally speaking, beginners learn to sketch first, and those who sketch well will naturally draw well in oil painting. The origin of sketch generally begins with the Renaissance. In fact, Greek bottle paintings and sculptures have a good sketch foundation.
The initial sketch is regarded as the manuscript of painting. For example, to make a mural, there must be a draft of the idea first, then a manuscript of the sketch, and at the same time, there must be a precise sketch of the hand and face.
It is customary to sketch murals without looking at models, and it depends entirely on the sketches prepared in advance and the painter's memory. Modern sketch has broken away from the original papers and exercises and can be appreciated as a work of art. The attitude of sketching not only cultivates descriptive power, but also cultivates the ability of modeling. In the end, only sketching can be appreciated as a work.
On the contrary, just looking at oil paintings can tell how accomplished the author is in sketch. Therefore, sketch is the basis of painting, and it is also the skeleton of painting, so beginners should learn sketch first anyway. Strictly speaking, sketch is only monochrome black and white, but it can still be regarded as sketch if light colors or colors are added.
The representation methods of sketch can be divided into: 1. According to the drawing materials, it can be divided into charcoal sketch, pencil sketch, charcoal sketch, pen sketch, silver pen sketch, brush sketch and so on. Second, the painted subjects can be divided into plaster sketch, landscape sketch, still life sketch, human body sketch and fantasy sketch. Third, according to the purpose of sketch, it can be divided into sketch as an idea, sketch as a draft, sketch, work and exercise.