This work shows a contrast between the white and the hot pink. There’s a contrast between the shades of pink too but the greatest contrast is with the actual work and background.
This work has contrast between the face in the photo and the holes created in the face. It creates this hollow look on the person.
The contrast between the cropped playboy bunny and the background gives this chopped look. The pink font doesn’t contrast the background much but it does contrast the black bunnies.