90.0 cm by 33.0 cm and 187.0 inch by 150.0 inch is the size of the painting . This was painted in 1622 . The artist of Diana and Callisto was Vladimir Tretchikoff . oil on board was the medium for this . Diana and Callisto is at Santa Maria del Popolo, Rome
Vladimir Tretchikoff's painting was 190.0 inch by 153.0 inch in size