kai tomohisa, matsuoka chie, sentimental graffiti, painting (medium), traditional media, watercolor (medium), 1990s (style), 1girl, bandeau, bikini, blue bikini, breasts, character name, cleavage, copyright name, cowboy shot, dated, day, diving mask, diving mask on head, english text, female focus, from side, goggles, goggles on head, hair between eyes, high ponytail, holding, holding swim ring, innertube, legs apart, outdoors, ponytail, postage stamp, retro artstyle, snorkel, solo, stamp, strapless, strapless bikini, swim ring, swimsuit