"Sculpture on the piers of House D of the palace was even more three-dimensional than on the Temple of the Inscriptions. Pacal's portrait of Pier D is a fine example. Every detail of this face stands out beautifully modeled. The personified tree in his hair ornament holds a completely three-dimensional flower."
Merle Greene Robertson, Sculpture and Murals of the Usumacinta Region, in MAYA [Palazzo Grassi, Venice 1999] p.300