Alexey Bogolyubov is high in key: pale, luminous, and filled with optical air. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. All colours lean toward grey, building depth through value rather than colour punch. Alexey Bogolyubov gives 31.0% of the composition to a single #E8E9BE - a decisive chromatic anchor. Only 2.8% is devoted to #BB8E52, yet that small allocation delivers the palette's entire chromatic tension. The value range spans 66 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. Palette 4 sits within the larger chromatic argument that Alexey Bogolyubov's complete body of work advances.