1girl animal_ears arm_behind_head arm_up armpit_focus armpits bangs blush breasts brown_hair cleavage detached_sleeves dress highres horse_ears layered_dress long_hair looking_at_viewer low_twintails may9 medium_breasts multicolored_hair parted_lips signature solo stretching twintails two-tone_hair umamusume unfinished upper_body yamanin_zephyr_(umamusume) yellow_eyes