Vibrant Rainbow Lips Collection

Prompt:  Create a 2x2 grid of close-up, stylized images of human lips, each tinted with different bold colors. The top left lips are yellow-green, semi-glossy, and set against a subtle lime background. The top right features emerald green lips with a slightly glossy finish on a mint background. Bottom left showcases vivid cobalt blue lips, matte, against a lighter azure backdrop. The bottom right lips are rich magenta, with a velvety texture, on a soft pink base. All lips are plump and well-defined, with slight variations in the curves and peaks of the Cupid's bow, implying individuality. The whole image has a pixelated, halftone effect reminiscent of a digital screen or print, with noticeable dots giving it a pop art aesthetic.