Insufficient writing power.
This kind of work is mostly copied, but the essence of it is not understood.
Brush calligraphy refers to characters written according to traditional rules, rather than words written randomly with a brush. Calligraphy is the art of line modeling. The so-called brush technique mainly refers to how to use the brush to create ideal lines. As a writing tool, the pen has a very long history. As early as the Neolithic Age, there are traces of brush painting on the painted pottery.