George Clark learned early in his career painting from life to work fast and to work in oil paint on paper for shorter poses. He had a teacher who pointed out that Degas and Toulouse-Lautrec frequently painted with oil paint on paper. He said if you work on good paper the art will last for a hundred years, and after that you can let conservators worry about it.

Clark developed a technique for painting poses of an hour or less, blocking in big shapes with transparent washes of oil and then working back into them with coloured pencils and opaque oil paint. Eventually he discovered pens that drew permanent black lines in in a water-based ink that dried waterproof, so he could add watercolour to his ink drawings, and he transitioned mostly to that medium for his works on paper, although he continued to work in oil paint on canvas.

Eight of the paintings in this portfolio are now in the permanent collection of the Kinsey Institute at Indiana University.