1girl animal_ears arknights arms_behind_back bangs bikini blunt_bangs brown_eyes criss-cross_halter feet_out_of_frame flat_chest grey_hair halterneck highres horse_ears io_(io_oekaki) laurel_crown long_hair looking_at_viewer parted_lips platinum_(arknights) see-through simple_background smile solo standing swimsuit very_long_hair white_background white_bikini