Also, Suo was good at the painting theory and when he was fifty-six years old, he preludized for the theory on Chinese paintings "Sansuikoshu" (High Atmospheric Landscape) by Yozan HAMACHI in Ise and commented for "Rongashi" (Theory on painting and poetry) by Kino Shunkin.
また、菘翁は画論にも長けており56歳の頃、伊勢の浜地庸山の著した中国画論『山水高趣』に題言を寄せ、紀春琴の『論画詩』にも評を加えている。