Such figures are called atlantes, from Atlas, the giant who supported the heavens. In the Graeco-Buddhistic art of Gandhara this pose was used as support figures on the bases of stupas or reliefs. In classical art the atlantes are never winged, also this is typical Gandhara. The wild hair and beard are classical features, somewhat Herculean.                                                         The back shows horizontal chisel grooves.

Northwest Pakistan, schist stone, 3rd century. 29 x 17(H) x 5.5 cms