Adding More Color and Texture to the Sketch by Shading
Next, continue to build up darker values in areas of shadow, leaving areas of highlight untouched. However, if you want to draw with a lighter color over a darker area, lighter pencil marks will partially cover darker strokes. You can see the color and texture built up with the Pencil in Figure 8.
Figure 8 In this example, I’ve built up more color and texture. To add highlights to the top of the tree, I used a lighter color of gold.