1girl armpits arms_up bikini black_bikini breasts brown_eyes chiyomaru_(yumichiyo0606) cleavage collarbone grey_background groin hair_between_eyes highres long_hair looking_at_viewer love_live! love_live!_sunshine!! medium_breasts navel red_hair sakurauchi_riko side-tie_bikini sideboob simple_background sketch solo standing swimsuit very_long_hair