The value structure of Leonello Spada is mid-key: quiet, controlled, and cohesive. The dominant temperature is warm, with earth tones and fire-hues setting the emotional key. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. #1C1413 claims 33.8% of the surface, functioning as the work's tonal foundation. The highest-chroma note - #852A1A - appears at just 1.2%, deployed as a precision accent against the quieter ground. A value spread of 56 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. Palette 4 sits within the larger chromatic argument that Leonello Spada's complete body of work advances.