Juan Manuel Blanes is low-key throughout, a quality associated with Nocturnal Sienna - deep shadows dominate the composition. Yellow, ochre, sienna: warm hues that Juan Manuel Blanes deploys as the palette's primary energy. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. The dominant colour, #171514, takes 27.3% of the total area, establishing the overall mood before any other hue is introduced. The saturated accent, #AD8C71, registers at 4.0% - sparse enough to feel like a deliberate surprise. The full value range is 55 units: broad enough to build convincing three-dimensional form. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. In the context of Juan Manuel Blanes's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.