Low-key values are the structural spine of Juan Martín Cabezalero, giving it gravity and atmosphere. Juan Martín Cabezalero orchestrates warmth above all else - reds, ambers, and siennas take the lead. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. #130D0A claims 37.3% of the surface, functioning as the work's tonal foundation. At 5.9%, #561C0D carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. At 49 units across the value scale, the palette keeps contrast readable without letting it dominate. This tonal restraint is characteristic of the Juan Martín Cabezalero approach: colour serves light, not the reverse. Palette 4 sits within the larger chromatic argument that Juan Martín Cabezalero's complete body of work advances.