1girl, arknights, bare_shoulders, bikini, black_hair, blue_sky, breasts, cleavage, cloud, day, echj, grey_eyes, jacket, large_breasts, long_sleeves, looking_at_viewer, ocean, off_shoulder, official_alternate_costume, open_clothes, open_jacket, outdoors, roberta_(arknights), roberta_(summer_flowers)_(arknights), short_hair, sitting, sky, smile, solo, swimsuit, tail, thighs, wariza, water, white_bikini, white_jacket, wide_sleeves