The value structure of Ivan Shishkin is mid-key: quiet, controlled, and cohesive. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. The saturated accent, #9E9359, registers at 5.4% - 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 mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Palette 20 sits within the larger chromatic argument that Ivan Shishkin's complete body of work advances.