1girl, arknights, bare_shoulders, black_choker, blue_background, breasts, choker, criss-cross_halter, halterneck, horns, long_hair, looking_at_viewer, off_shoulder, official_alternate_costume, parted_lips, purple_eyes, red_hair, solo, surtr_(arknights), surtr_(colorful_wonderland)_(arknights), upper_body, very_long_hair, xx_(m1yee)