Ancient Roman statue of Hera, formerly in the Barberini Collection, restored as Demeter by Gaspare Sibilla. 

This is a replica of a 5th century BC Greek original from the school of Phidias. 

Exhibited in the "Sala Rotonda" (Round Hall) in the Museo Pio-Clementino (Vatican Museums).

Source: Wikipedia

Hera stands in a long layerd flowing robe, a crown on her head, a staff raised in her right hand, her left hand holding the edge of her robe.