1girl, 729258659, animal, animal_ears, arknights, ball, battery_indicator, beach, beachball, bikini, blue_sky, braid, breasts, bright_pupils, brown_eyes, brown_hair, choker, cloud, cloudy_sky, collarbone, day, holding, innertube, navel, ocean, off_shoulder, official_alternate_costume, otter, otter_ears, otter_girl, otter_tail, outdoors, planted, planted_umbrella, recording, roberta_(arknights), roberta_(summer_flowers)_(arknights), sand, seashell, shell, short_hair, shorts, sky, small_breasts, solo, stomach, swimsuit, tail, umbrella, viewfinder, water, white_bikini, white_choker, white_pupils, white_shorts