1girl animal_ears blue_eyes bow bowtie brown_hair hat horse_ears horse_girl horseshoe_ornament jack-o'-lantern long_hair long_sleeves looking_at_viewer mini_hat misu_kasumi mr._c.b._(umamusume) open_mouth purple_bow purple_bowtie purple_shirt revision sailor_collar sailor_shirt school_uniform serafuku shirt simple_background solo tongue tongue_out tracen_school_uniform umamusume upper_body white_background white_headwear winter_uniform