takku, ryuzaki kaoru, idolmaster, idolmaster cinderella girls, highres, 1girl, bare arms, bare legs, bare shoulders, bikini, blush, breasts, cloud, from below, greyscale, hair ornament, hairclip, knees, looking at viewer, monochrome, navel, ocean, open mouth, outdoors, outstretched arms, parted bangs, short hair, sky, small breasts, solo, standing, stomach, swimsuit, teeth, upper teeth only, water, wet