1girl, arknights, bird, black_choker, blue_sky, breasts, choker, cleavage, day, hair_ornament, hair_rings, horns, long_hair, medium_breasts, official_alternate_costume, parted_lips, purple_eyes, red_hair, seagull, sky, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, swimsuit_cover-up, thigh_strap, water, yeyuanqianqianqian