The value structure of Charles-Nicolas Guillon is mid-key: quiet, controlled, and cohesive. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. Only 5.4% is devoted to #61321A, yet that small allocation delivers the palette's entire chromatic tension. A value spread of 64 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. The palette is recognisably Charles-Nicolas Guillon's own: particular in its temperature, chroma, and the economy of its brightest note.