Final answer:
Complementary paintings to the Andy Warhol portrait with soup cans include his silkscreen paintings of celebrities and his works featuring currency and branded products, all reflecting his Pop Art style.
Step-by-step explanation:
Paintings that complement a portrait of Andy Warhol with a background of soup cans would ideally reflect Warhol’s iconic pop art style and subject matter. Such complementary artworks could include his famous silkscreen paintings of celebrities such as Marylyn Monroe, Elvis Presley, and Elizabeth Taylor. These paintings, like the Campbell's Soup Cans, feature everyday objects and popular figures, highlighting Warhol's interest in mass culture and his impact on the Pop Art movement. It would be suitable to also consider pieces from his money paintings like the $100-dollar bills and other branded product works such as the Coke bottles.
Warhol’s art, particularly his Campbell's Soup Cans, challenged traditional notions of what could be considered fine art by focusing on the commercial and the mundane, as discussed in educational resources like Khan Academy. The striking simplicity and the repeated motifs in Warhol's works make them instantly recognizable, making any of these subjects appropriate companions to the soup can landscapes that showcase Warhol's fascination with consumption and repetition.