A kneeling woman in a white gown and golden cloak extends her hand toward the Christ Child, who sits on the Virgin Mary's lap at the center of the scene. To the left, three angels stand closely together, their faces turned toward the central group, their garments rendered in soft whites and pinks, with golden wings catching the light. On the right, another angel in yellow and blue gazes serenely at the Virgin and Child, while two small cherubs play at her feet, one looking up in adoration.

Above, a host of cherubs and angels emerges from swirling clouds, their faces illuminated by a soft, golden glow that bathes the upper part of the canvas. One cherub descends holding a palm frond and a crown, symbols of martyrdom and victory, while others hover nearby, their delicate wings and rosy cheeks painted with feathery brushstrokes. The architectural setting is suggested by a grand archway in the background, its pale stone contrasting with the dark, atmospheric shadows that envelop the figures.

On the tiled floor in the foreground, a sword and a spiked wheel lie abandoned, traditional attributes of Saint Catherine and reminders of her martyrdom. The composition draws the figures into a harmonious circle, with gentle gestures and glances linking each participant in the sacred drama. The paint surface shows smooth, delicate handling, especially in the rendering of flesh and drapery, while the clouds and background dissolve into misty, atmospheric effects.

Small details, such as the glint of light on the sword and the intricate folds of Saint Catherine's gown, reveal the artist's attention to texture and material. The Mystical Marriage of Saint Catherine was painted by Bartolomé Estebán Murillo in 1682.