Graphic illustration. Drawing in the technique of graphics. It can be a simple or black pencil. The drawing is applied in the form of strokes and spots. The main requirement of graphics is the presence of only one line color. Botanical illustration. This is a picture that is an image of the object being described. These are usually used in school or university textbooks. Technical illustration. These are all kinds of drawings, which are mandatory accompaniment to all engineering documentation. Illustration with special techniques. These include origami, embroidery, modeling, applique, ikebana, etc.