1girl 2833osi animal_ears bad_id bad_twitter_id black_hair blue_eyes book braid braided_ponytail choker closed_mouth grey_jacket highres holding holding_book horse_ears horse_girl jacket light_blush long_hair looking_at_viewer low_ponytail neckerchief sailor_collar simple_background smile solo split_mouth umamusume upper_body white_background yellow_neckerchief zenno_rob_roy_(umamusume)