The purpose of the drawings of the invention is to enable technicians to understand the invention with reference to the drawings. As long as your drawings are sufficient to express the characteristics of the invention, you can draw several faces. Because yours is a foldable square, it is recommended that the attached drawing should include the state of the object before and after folding. If necessary, the state during the folding process can also be drawn. In short, the picture must be attached so that others can understand it!