Focus on Girl in Mirror and explore the Reception.
The New York Times notes that this was an example of Lichtenstein's ability to "glorify the American woman by giving innocuous images of her generic concocted self and her roiling emotions such blazing formal power". Framing a small fragment of the image in the mirror serves an artistic purpose. "Extraordinary sections like ... linking the falling hair to the semi-reflected face of the girl in the mirror (Girl in the mirror, 1964) ... which cut up, analyse, and unite, all have the one aim of intensifying the signifying fragment."
The New York Times