Regarding the form of the portrait, it has a construct that Prince Shotoku is placed between another two princes (Prince Yamashiro no oe on the right side, while Eguri-O on the other side, as the story goes) drawn a little smaller than Prince Shotoku.
その形式は太子を中に置いて左右には2人の王子（伝えられるところによれば、右側が山背大兄王、左側が殖栗王）を少し小さく配置した構成。