1girl a_tea arknights arms_behind_back bangs beret blush bound bound_arms bound_legs breasts cardigan hair_ornament hairclip hat highres jewelry monochrome necklace official_alternate_costume one_eye_closed owl_ears pleated_skirt ptilopsis_(arknights) shibari simple_background skirt solo sweatdrop sweater thighhighs turtleneck turtleneck_sweater white_background