Encounter with Trolls, Bilbo's first real test outside the Shire. This encounter demonstrates Bilbo's inexperience and foreshadows his growth as a character. Medium - Watercolor. Composition - The trolls are large and menacing, occupying much of the canvas. Bilbo is in the foreground, small and stealthy. The trolls are caught mid-action, displaying their brutish nature. Color Palette - Dusky colors – purples and blues to depict the nighttime setting. Mood - A moment of danger with a tense atmosphere.