What are the artistic characteristics of the emperor image in calligraphy?

The emperor was born in Jiangdu, Guangling (now Yangzhou, Jiangsu), and his date of birth and death is unknown. A famous calligrapher in Wu Dong during the Three Kingdoms period. Zeng Guan went to China and Qingzhou for secretariat. Good at eight points, small seal script, especially good at zhangcao. His Cao Zhang, Cao Buxing's paintings and Yanwu's Weiqi are also called "Eight Wonders". The Emperor's Cao Zhang is wonderful, and the masterpiece is Urgent Chapter. Urgent Chapter is an ancient literacy textbook. The "urgent chapter" written by calligraphers handed down from ancient times was first written by the emperor. Its engraving is the most famous "Songjiang Edition". The original stone carving is now in Shanghai Songjiang County Museum. There are as many as 1394 words. Clear strokes and standard structure are good examples for learning from Cao Zhang. The characters of the emperor's portrait have distinctive characteristics and high achievements, which have been well received by calligraphers of all ages. For example, Yang Xin of the Southern Song Dynasty said, "Wu Can is the emperor of grass, and the world is called calm and happy." Tang Doufu described his writing as "like a dragon biting, stretching and reopening". Zhang Huaiguan said: "The official script of the right army, one form, and all the characters are different; Hugh Cao, with all the characters in one form, is the same, and each makes its own extreme. "