De Erdely encouraged his students to develop their awareness of anatomy, and in his own work his extensive knowledge of the human form is apparent. He had studied anatomy and performed dissections, and his brief career as a professional boxer undoubtedly increased his awareness of the human body. De Erdely always drew his figures as well formed and substantial, and often in mature drawings, as in Mexican Dance, he made sculptural masses of the figures, breaking up the head, limbs, and torso into massive, blocklike forms with faceted surfaces. De Erdely constructed Mexican Dance as a drawing, modeling the figures with a heavy black line and applying an overlay of pale washes of naturalistic pink, aqua, and yellow.
Among de Erdely’s favorite subjects in his late years were Mexicans and Spaniards dressed in folk costumes. He often depicted dancers-at rest and in motion-and typically focused on one or two individuals. In Mexican Dance the couple’s gestures suggest that they are performing a folk dance, and yet their poses appear somewhat contrived. This composed quality, commented on when the watercolor was first exhibited, may be merely decorative. It also may have derived from de Erdely’s preference for studying one model at a time rather than the ensemble of figures and his wish to describe the individual’s solitary alienation.