The high-key values of William-Adolphe Bouguereau give it an effulgent, almost bleached quality. William-Adolphe Bouguereau orchestrates warmth above all else - reds, ambers, and siennas take the lead. All colours lean toward grey, building depth through value rather than colour punch. The highest-chroma note - #927450 - appears at just 11.1%, deployed as a precision accent against the quieter ground. Value range is moderate at 54 units - enough contrast for legibility, not so much as to fragment the tonal unity. Palette 4 sits within the larger chromatic argument that William-Adolphe Bouguereau's complete body of work advances.