How to evaluate Mao Dun's calligraphy?

In the modern literary world, Mao Dun is a writer with high calligraphy attainments. Even in the modern book world, Mao Dun's calligraphy is still very innovative. In the running script, Mao Dun's calligraphy has the steadiness of Wei Bei, the elegance of "thin gold body" and the literati temperament of a writer, which gives people a high degree of aesthetic pleasure. I have to say, as a writer who is not a calligrapher, Mao Dun.