What is the style of calligraphy written by Xia Huan, a great calligrapher in Chongqing?

Shouzi is a regular script, which uses the brushwork and structure of Liu style. Presumably, he must have practiced Liu Ti, and Qing is a running script. His writing is not bad. Judging from his brushwork and structure, he should have made great efforts in calligraphy, especially regular script, but his level is lower than that of his contemporaries.