1boy 1girl absurdres alternate_costume animal_ears arm_under_breasts black_skirt breasts brown_hair cowboy_shot green_serafuku hand_on_own_chest highres horse_ears horse_girl large_breasts light_brown_hair long_hair long_sleeves looking_at_viewer multicolored_hair pleated_skirt satono_diamond_(umamusume) school_uniform serafuku skirt solo_focus streaked_hair trainer_(umamusume) twitter_username umamusume very_long_hair white_hair yamano_rokamizu yellow_eyes