What are the artistic features of Tie Bao's calligraphy?

Tie Bao (1752 ~ 1824), a Manchu Huang Zheng Banner, was born in Ye Ting, with a nickname of Mei 'an and Tieqing. The old surname was Ai Xinjue Roche, later changed to Dong A's, claiming to be a descendant of Zhao. In the thirty-seventh year of Qianlong (1772), he was a scholar. During the Jiaqing period, officials went up to the governors of Liangjiang and down to the ministers of the official department. Twice demoted, full of frontier fortress. Tie Bao is good at poetry. When he was young, he was called three gifted scholars with Bai Ling and Fa. In his spare time in politics, he studied calligraphy and painting, Yan Zhenqing in regular script, and the patriarchal clan system in cursive script. Huai Su and Sun Erwang were combined into one furnace, which was one of the "four schools of Qianlong". The inscription of "Wei Tie" is highly valued by Shilin. The Liaoning Museum has a volume of Tie Bao's Neighboring School Law, including Preface to Yan Zhenqing Liu Taichong, Yan Zhenqing Deer Chest Post, Yan Zhenqing's Sacrifice to His Nephew, and Learning from Your Majesty's Inscription in Ancient Times. The books are similar in spirit, each with a focused momentum, corresponding heart and hand, and different in spirit, which shows Lin Chi's great achievements. The running scroll collected in the Palace Museum in Beijing is thick, dense, restrained and pithy, and has its own strength. Although the writing pen still has the characteristics of Wang Shu, the spacing is wide and sparse, which has the charm of calligraphers Ni and Huang Daozhou in the late Ming Dynasty and the characteristics of his own book.