つまりあの絵は秋雲先生が描いていた…？
この絵の秋雲先生は左手で描いてますが、右利きなのか左利きなのかいまいち不明…。きっと片方が使えない状態でももう片方で描けるように両方鍛えたのだ、と勝手に解釈してます(笑)

Noshiro entangled in deep-sea abomination lightning" omake
In other words, that picture was drawn by Akikumo-sensei...?
In this picture, Akikumo-sensei is drawing with his left hand, but it is unclear whether he is right-handed or left-handed.... I am sure that he trained both hands so that he could draw with the other hand even when he could not use one of them, I interpret it on my own.