This document discusses techniques for creating form and value on a 2D surface by modeling historical and contemporary artists. It covers using different parts of the pencil lead to create textures, controlling line weight for highlights, cross-contour shading to give objects form, and using graduated shading to depict 3D shapes realistically or in an abstracted form. Examples are given of artists like Rembrandt, Courbet, Seurat, Wiley, and Celmins who demonstrate value techniques.