Note: I appreciate the invaluable assistance of Kimberly to correct some mistakes in the names of the ballerinas.
(From up to bottom and from left to right)
Darci Kistler, Helena Alexopoulos, Kyra Nichols, Merrill Ashley, Maria Calegari (sitting on the pedestal) and Judith Fugate (sitting on the floor)
Source and more info at:
Photographer Irving Penn for Vogue (1991)