In 1913, Knight made a painting that was a first for a woman artist, Self Portrait with Nude, showing herself painting a nude model, the artist Ella Naper. The painting is a complex, formal composition in a studio setting. Using mirrors, Knight painted herself and Naper as seen by someone entering the studio behind them both. As an art student Knight had not been permitted to directly paint nude models but, like all female art students at the time, was restricted to working from casts and copying existing drawings. Knight deeply resented this and Self Portrait with Nude is a clear challenge, and reaction, to those rules. The painting was first shown, in 1913, at the Passmore Edwards Art Gallery in Newlyn and was well received by both the local press and other artists. Although the Royal Academy rejected exhibiting the painting, it was shown at the International Society of Sculptors, Painters and Gravers in London, as The Model. The Daily Telegraph critic called the painting "vulger" and suggested that it "might quite appropriately have stayed in the artist's studio." Despite this reaction, Knight continued to exhibit the painting throughout her career and it continued to receive press criticism. After Knight died, the picture, now known simply as Self Portrait (1913), was purchased by the National Portrait Gallery and is now considered both a key work in the story of female self-portraiture and as symbolic of wider female emancipation.