Final answer:
Roy Lichtenstein used comic-book images with characteristic printing dots to produce 'Drowning Girl'. He manually applied Ben-Day dots, a mechanical pattern found in engraving, to create his paintings. This technique became a signature in his art, blending the commercial and comic world with fine art.
Step-by-step explanation:
Roy Lichtenstein, an American Pop artist, used comic-book images with characteristic printing dots to produce 'Drowning Girl'. Lichtenstein altered the image using Ben-Day dots, a mechanical pattern found in engraving that he manually applied to his paintings by hand. His use of dots became a signature technique in his art, bringing the mechanical appearance of the commercial and comic world into the realm of fine art.