Focus on Ognissanti Madonna and analyze the Technique.
Giotto was the first artist to depict three-dimensional figures in western European art. Additionally, he used a much smaller space than other contemporary artists, further emphasizing the importance of the bodies in the artwork. Giotto did away with many aspects of Byzantine art that would flatten the painting.  Within Cimabue's Virgin and Child Enthroned, there is the use of gold tracing to delineate the folds of the fabric.  In contrast to this, Giotto's fabric folds are more realistic, and instead of lines he used light, shadow, and color to create the appearance of fabric.  Contours of the body underneath these fabric folds are also visible, specifically in the Virgin's knees and also around her breasts. 
Giotto used a value scale, a distinct range of light and darks, to create a sense of volume in his figures, giving them the slight smokiness that is usually characteristic of Leonardo da Vinci and later Renaissance artists.
Cimabue Renaissance Giotto Leonardo da Vinci