The image shows a portrait of a man in a blue robe, painted in a photo frame on a white surface. The man is believed to be Sir Thomas Rowlandson, as indicated by the title of the painting. He is wearing a blue coat and has a serious expression on his face. His hair is dark and his eyes are focused intently on something in the distance. His hands are clasped in front of him, and his posture is upright and dignified.