Operational definition of sketch: the drawing method of expressing objects with a relatively single color 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 art of restraint that needs rational assistance most. Generally speaking, beginners learn to sketch first, and those who sketch well will naturally draw well in oil painting. The origin of sketch generally began in the Renaissance. In fact, Greek bottle paintings and sculptures have a good sketch foundation. The original sketch is considered as a manuscript of painting. For example, to make a mural, we must first have a draft of the idea, then a draft of the sketch, and at the same time, we must have an accurate sketch of the hand and face.
Painting murals is used to not looking at the model, relying entirely on the sketches prepared in advance and the painter's memory. Modern sketch is divorced from the original paper and practice, and can be appreciated as a work of art. The attitude of sketch not only cultivates the power of description, but also the ability of modeling. Finally, only sketches can be appreciated as works. On the contrary, just looking at oil paintings can show how accomplished the author is in sketching.
Therefore, sketch is the basis and skeleton of painting, so beginners should learn sketch first anyway. Strictly speaking, sketch is only monochrome black and white, but if you add light color or color, it can still be regarded as sketch.
Sketch representation method is divided into:
First, according to the painting materials can be divided into charcoal sketch, pencil sketch, charcoal sketch, pen sketch, silver pen sketch, brush sketch, etc.
Second, painting themes can be divided into plaster sketch, landscape sketch, still life sketch, human body sketch and fantasy sketch. According to the purpose of sketch, it can be divided into sketch as an idea, sketch as a draft, sketch, work and practice.