Final answer:
Giotto's Enthroned Madonna is considered naturalistic due to Giotto's use of lifelike proportions, chiaroscuro, and expressive features, diverging from the stylized Italo-Byzantine art form.
Step-by-step explanation:
Giotto's Enthroned Madonna appears naturalistic because of the significant strides he took in breaking away from the Italo-Byzantine art form. Unlike his predecessors, Giotto began to use lifelike proportions and shading, which can be seen in his technique of chiaroscuro, allowing for a more three-dimensional representation. Giotto's figures were also rendered with highly expressive features and a sense of volume within the drapery of their garments, creating a realism previously not seen in religious iconography. This attention to realistic detail is further enhanced by the use of foreshortening, giving the figures a sense of depth and presence within the painting. While he did not use linear perspective as seen in works later in the Renaissance, Giotto's approach to creating a convincing illusion of space and natural expressions marked a clear departure from the more stylized representations of the period.