1girl animal_ears black_one-piece_swimsuit blue_archive blue_eyes blush breasts cleavage closed_mouth competition_swimsuit covered_navel cross_hair_ornament grey_hair hair_between_eyes hair_ornament halo hand_on_hip highres looking_at_viewer medium_breasts medium_hair official_alternate_costume one-piece_swimsuit shiroko_(blue_archive) shiroko_(swimsuit)_(blue_archive) simple_background solo swimsuit yun_(kbdenz9)