The choice of the tonal palette literally sets the tone for the drawing. It creates the governing mood, sense of light, and time of day. It’s at the heart of how we experience the drawing on an emotional level. If you begin to pay attention to this, you’ll see this principle used in everything from greeting cards to advertising to movies. The musical corollary extends here, too. If I compose a piece of music using a major scale, it will have one emotional quality. Use a minor scale, another. High in the treble clef, one quality; low in the bass, another.