The fresco is a particular painting technique; it is executed by spreading a layer of paint, diluted with water, directly into the fresh wall plaster. Once dry, the colour becomes bright and compact. On the middle pillar between the nave and the northern aisle, there is a fresco depicting the Virgin Mary on the throne with Child. The style of the work immediately made you think of an unknown Spanish artist from the first half of the 15th century. The aesthetic canons of the fresco can be attributed to a painter who, in addition to his knowledge of Italian art, is linked to the Spanish Gothic culture that became widely spread in Sicily during the Middle Ages.
The Madonna is depicted wearing a crown, wrapped in a blue mantle, seated on a throne with a high back, while holding the baby Jesus, who also wears a crown. At the corners of the throne, there are two angels praying.