Hartigan's belief that painting must have "content and emotion" continued throughout her career. Even though her work is often associated with Pop art, Hartigan disliked the idea of mass manufacturing that Pop embraced, preferring the emotion generated by the evident hand of the artist.
Hartigan's best-known works combine the abstraction of her early work with recognizable images from everyday life or motifs from art history, particularly from the Renaissance and Baroque periods. The distinction between abstraction and figuration is often blurred by her experimental brushwork and lack of shading."(theartstory.org)