caption: The image shows a portrait of a man with a beard and a white turban, painted on a paper with text at the bottom. The man is believed to be Sultan Qaboos, the Sultan of Persia. He is wearing a traditional turban and has a serious expression on his face. His hair is neatly combed and his eyes are focused intently on something in the distance. The painting is done in a realistic style, with vibrant colors and intricate details.