Portrait of the Artist´s Sister, Cecilie Margrethe Petersen, née Købke 1835

"Portrait of the Artist´s Sister, Cecilie Margrethe Petersen, née Købke" is a 1835 oil on canvas painting by Danish artist Christen Købke. The work depicts Købke’s sister, Cecilie Margrethe, seated against a dark background, wearing a red dress and green skirt. The painting is known for its realistic portrayal of the subject and the artist's signature use of light and shadow. It is a prime example of Købke’s work in portraiture and is a popular piece in the permanent collection of the Statens Museum for Kunst in Copenhagen, Denmark.