Liu Gongquan's masterpiece

Hello, is it Liu Gongquan's masterpiece? Liu Gongquan's representative works include Bell Tower Ming in Hui Yuan Temple of Datang, Engraved Diamond Sutra (Diamond Sutra Monument), Mysterious Pagoda Monument and Su Feng Monument. Liu Gongquan, a native of Jing, was an official, calligrapher and poet in the middle Tang Dynasty. His representative works include Bell Tower Ming in Tang Huiyuan Temple, Diamond Sutra Engraving, Xuanta Monument, Su Feng Monument and so on. He is good at Ci and Fu, and he is good at calligraphy. He is as famous as Yan Zhenqing and is called "Yan Liu".