A monumental seated figure in elaborate drapery dominates the centre, her body turned in profile as she leans intently over an open red book held close to her face. Her head is wrapped in a pale turban, and a pink mantle falls over her shoulders and arm, casting soft shadows across her white and green robes. To the left, a smaller, cloaked attendant sits hunched in shadow, his face indistinct, wrapped in a deep red garment that echoes the Sibyl’s drapery.

On either side of the architectural niche, two pairs of nude figures are rendered in grisaille, their bodies twisting in mirrored poses as they lean against the frame. The setting is a painted stone throne, with carefully modelled architectural details framing the figures and providing a sense of monumentality and depth. Light falls from the upper left, illuminating the Sibyl’s face, arms, and the folds of her garments, while casting the attendant and the background into deeper shadow.

Michelangelo uses a restrained, harmonious palette of whites, greens, pinks, and reds, set off by the neutral stone tones of the architectural elements. The brushwork is smooth and precise, with subtle gradations of tone modelling the figures and drapery, and a delicate texture visible in the transitions between light and shadow. The composition is tightly structured, with the massive form of the Sibyl anchoring the centre and the surrounding elements creating a balanced, rhythmic frame.

Every detail, from the Sibyl’s concentrated gaze to the complex arrangement of her robes, is rendered with a sculptural clarity that recalls Michelangelo’s work as a sculptor.