A young girl stands at the center of the composition, her gaze directed slightly to the viewer's left. Her light blond hair frames her round face and falls to her shoulders, contrasting with the dark background. She wears a wide, ornate dress with alternating bands of grey and vivid coral, decorated with pink bows along the sleeves and bodice.

A black lace collar encircles her neck, and a black necklace is visible above it. A large ornament, edged with pink ribbon, is fastened at the center of her chest. Her right hand rests gently on a green-draped table at the left edge of the painting, while her left hand holds a closed fan.

The skirt of her dress spreads outward, its surface catching the light and revealing the shimmering texture of the paint. She stands on a richly patterned carpet rendered in deep reds and black, its design visible beneath the hem of her gown. Behind her, a dark green drapery falls in heavy folds, providing a backdrop that frames her figure.

The artist uses visible brushstrokes to suggest the details of fabric, lace, and hair, while the girl's skin is painted with smooth transitions of tone. Subtle gradations of light model her face and hands, giving the figure a sense of presence against the shadowed setting. The composition places the girl upright and alone, with her body turned slightly to the side and her head facing forward. This is Portrait of Infanta Margarita by Diego Velázquez, dated 1655 in the museum record and 1656 in a source description linked to the Palacio de los Duques de Alba.

The subject is Margaret Theresa of Spain, depicted as a young girl, standing and dressed formally. A hand fan, blond hair, a necklace, and the presence of drapery and carpet are all described in the collection record and visible in the painting.