What are the four-character idioms that describe calligraphy and handwriting?

The pen is full of dragons and snakes, strong muscles and bones, iron-painted silver hooks, penetrating the back of the paper and writing freely.

Pen dragon snake

Interpretation: Describe calligraphy as very beautiful and skillful.

Yan gu yá n j Ι n

Interpretation: Yan: Tang Dynasty calligrapher Yan Zhenqing; Liu: Liu Gongquan, a calligrapher in the Tang Dynasty. Yan Liu's and Yan Liu's calligraphy are both powerful, but their styles are different. Also known as excellent calligraphy.

vigorous/forceful and fascinating strokes/flourishes (in calligraphy)

Interpretation: Describe the strength and softness of calligraphy.

Li de's story

Interpretation: It describes that calligraphy is vigorous and powerful, and the brush strokes simply penetrate the back of the paper. It also describes poetry as profound in conception and concise in words.

Easily Hu and s m: z rú

Interpretation: Describe painting, writing, composition and writing at will.