If the study is to be done by looking at the photograph or model while shading is done in the study, the darkest value and the most obvious value should be determined. After the sketch phase of the study is completed, the darkest areas should be painted before they are painted. Then the intermediate values should start painting and formatting. Note that formatting is an external form of each drawing. For example, a cylinder pipe is round. A round cylinder should be painted in a semicircle according to the form of the cylinder and not by a horizontal painting. In the human body, each piece has many different forms. Each piece should be painted separately.