Everyone who studies calligraphy knows that Wang Xizhi has no original works in the world. The prototype of this work is the dragon book of Preface to Lanting (a hook copy of Feng Chengsu, a calligrapher in the Tang Dynasty, which is now in the Palace Museum. It is said that the manuscript was buried in Zhaoling of Emperor Taizong of Tang Dynasty, which has not been confirmed or unearthed so far.
As for this work in the picture, it was written by someone who copied the Preface to Lanting several times at most, which is still far from the master. If you want a beautiful Preface to Lanting, you can buy it on Taobao and search it.