The value structure of Diego Rivera is mid-key: quiet, controlled, and cohesive. Diego Rivera builds on cool foundations: the palette favours the blue-cyan-green arc. All colours lean toward grey, building depth through value rather than colour punch. #232324 at 26.3% of the palette: an overwhelming presence that pulls all other colours into its gravitational field. The saturated accent, #AF713A, registers at 5.2% - sparse enough to feel like a deliberate surprise. Value range is moderate at 53 units - enough contrast for legibility, not so much as to fragment the tonal unity. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. Palette 4 sits within the larger chromatic argument that Diego Rivera's complete body of work advances.