Ou Yangxun's calligraphy is widely used by various schools, because it combines the characteristics of regular script in Han Li and Jin Dynasties, and also participates in the inscriptions in the Six Dynasties. The main features of Ou Yangxun's calligraphy style are rigor, neatness, honest and frank and vigor.
Although the glyph is a little longer, it is white, neat and rigorous, the middle palace is tight, the main pen is elongated, it looks bold and unrestrained, dense and well-organized, surrounded on all sides, exquisite and vivid, just right. The combination of stippling and painting, the structural arrangement, is that the middle of the plane is steep and powerful, and the fonts extend to the right, but the center of gravity is still very stable, without the feeling of inclination, which is interesting and dangerous.
Calligraphy in the late Tang Dynasty experienced prosperity in the middle of the prosperous Tang Dynasty, but it also reached its peak and declined. Although Liu Gongquan's fame was popular for a while, he was still slightly better than Yan Shu. Calligraphy flourished in the Tang Dynasty, but now it has declined. Liu Gongquan's regular script involves Ou Yangxun's brushwork, and some strokes are often closely interspersed, which is particularly broad, fine and angular. Although the pen was written by Yan Zhenqing, it is different from Yan Zhenqing's vigorous and broad style, which is particularly heroic.
References:
Baidu Encyclopedia-Tang Sijia