You can work as a single color with your pencil technique. In addition, these studies will illustrate the exercise of oil paints. These works that you can do in sketch books can turn into magnificent paintings in the future. The charcoal pencil and the charcoal pencil, a material that painters couldn’t give up for centuries, have always aroused a different kind of admiration. These light-shade and contour works, which set aside the color richness of oil paint and watercolor paintings, are a work of art in addition to their own, and they play a guiding role for color studies.