Rule 34 Dev - 1girl animal_ears aston_machan_(umamusume) blurry blurry_background bow bowtie character_doll closed_mouth crown dated doll hand_up happy_birthday highres holding holding_doll horse_ears looking_at_viewer red_nails red_shirt ruisuke shirt short_hair simple_background smile solo umamusume upper_body v vest white_vest yellow_eyes|21902623236