score_9, score_8_up, score_7_up, source_anime, 1girl, solo, cosplay, mudrock, arknights, short hair, white hair, indoors, hotel room, playing cello, cello, large cello, bow (music), spread legs, Satoshi Urushihara style, ultra detailed, possmach,blush, nose blush, bare shoulders, floating hearts,  spoken heart,posmach