1girl, ambience_synesthesia, arknights, ascot, black_ascot, black_dress, blush, breasts, detached_sleeves, dress, evening, flute, from_behind, full_body, hair_spread_out, holding, holding_instrument, horns, instrument, knees_up, long_hair, long_sleeves, looking_at_viewer, looking_back, lying, medium_breasts, ocean, official_alternate_costume, on_back, on_ground, outdoors, parted_lips, red_eyes, shining_(arknights), solo, sunset, tuzhate, very_long_hair, water, white_hair