Edouard Riou is high-key - luminous, open, and weighted toward light. Cool hues prevail: blues, greens, and greys anchor the palette's emotional temperature. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The saturated accent, #5B543C, registers at 3.9% - sparse enough to feel like a deliberate surprise. At 62 units of value range, the palette has the tonal breadth to sustain complex spatial readings. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Edouard Riou's full range of palettes, group 2 represents one movement in an ongoing chromatic dialogue.