Rule 34 Dev - 1girl alternate_costume arms_up artist_name barefoot brown_hair commentary crop_top green_eyes green_shirt grey_pants grin handstand highres long_hair looking_at_viewer midriff mr._c.b._(umamusume) mukakin navel pants shirt short_sleeves simple_background smile solo stomach tail umamusume upside-down white_background|22175383113