A woman sits in full-length view beneath a stone arch, her body turned slightly to her left and her gaze directed outward, meeting the viewer. She wears a voluminous silver gown with elaborate gold embroidery that catches the light, its folds rendered with shimmering highlights and deep shadows. Her sleeves are puffed and slashed, and her bodice is tightly fitted, adorned with intricate gold patterns that echo the vertical lines of her skirt.

A large, translucent ruff encircles her neck, framing her pale face and accentuating her composed, almost reserved expression. Her hair is styled high and adorned with jewels, a feather, and red flowers, while a delicate crown or diadem rests on her head. In her right hand, she holds a closed fan, its handle pointed downward, while her left hand rests on the arm of a red velvet chair studded with gold.

A small dog with a dark coat and white markings perches on the arm of the chair to her left, its head turned toward her and its body half-hidden by the folds of her dress. Behind her, a dark curtain is drawn back to reveal a classical architectural setting, with fluted columns and a coffered arch framing the composition. The floor beneath her feet is tiled in black and white, its geometric pattern leading the eye toward the richly painted textures of her gown.

The light falls from the left, illuminating her face, the metallic sheen of her dress, and the gold details, while the background recedes into shadow, lending depth and drama to the scene. The brushwork is precise and smooth in the rendering of her face and hands, while the fabric is painted with broad, fluid strokes that capture the play of light across silk and gold. The composition is carefully balanced, with the sitter's figure dominating the foreground and the architectural elements providing a sense of grandeur and stability. Portrait of Marchesa Maria Serra Pallavicino was painted by Peter Paul Rubens in 1606, early in his time in Genoa.