Sally and Mike are two colorful monsters sprinting away from Randall. Their big eyes are filled with fear as they gallop across the page, desperate to get away. Randall, a much larger monster, is chasing after them with a fierce expression on his face. His purple skin stands out bold and menacing, making his menacing intentions clear. To further emphasize the danger of this scene, you may want to make Randall's colors bold and dark, like black, deep red and brown. As for Sally and Mike, colors like bright green, yellow, and orange can convey their plight and the feeling of their frantic escape.