Ancient alien overlord enthroned in a vast sci fi hall

A cinematic style image of an ancient alien overlord. The evil overlord has an alien face that is greenish in color and long arms and legs. He is adorned in a galactic emperors robe. He has many of his high priests and acolytes surrounding him in his Throne Room. Behind him is a huge window which reveals the Overlord City with space ships flyin over the city. The scene is very detailed with rich coloration. Done in a cinematic science fiction art style.