1girl, arknights, bare_shoulders, bikini, blue_sky, breasts, cleavage, criss-cross_halter, day, detached_sleeves, feet_out_of_frame, hair_ornament, hair_rings, halterneck, hammock, hand_up, horns, inseki11, long_hair, looking_at_viewer, official_alternate_costume, outdoors, purple_eyes, red_hair, side-tie_bikini_bottom, sitting, sky, smile, solo, star_(symbol), star_hair_ornament, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), swimsuit, thigh_strap, thighs, very_long_hair