Please analyze Wang Xizhi's Preface to Lanting from the perspective of calligraphy appreciation standards. Use pen, knot, composition and ink. Thank you very much

I will briefly say a few words about your question; I didn't copy Lanting very much. I copied three pieces of rice paper with a length of two meters and a width of one meter, and copied a dozen pieces of rice paper with a length of one meter and a width of 0.5 meters, all of which were pasted one by one. My feeling is; One; Use a pen-the nib is used incisively and vividly. Many book reviews say that the center should use a pen. I copied the preface of Lanting five times, but I couldn't find the feeling of using a pen. Second; Structure-The structure of Lanting Preface is ever-changing. The same word, the same radical, no one is the same. Some words, such as one with six or seven characters, are unclear. I'll have a look again sometime. The structure is not easy to adjust, so I use the change of brushwork to solve the same problem. Composition-there have been too many comments since ancient times, so I won't say it. Ink color-because the manuscript of Preface to Lanting was presented by Feng Chengsu in the Tang Dynasty with double hooks, it goes without saying that it is not the original.