Is Tian Yingzhang's copy of the practical skills of pen regular script good?

Well, the pen copybooks of Tian Yingzhang, Si Mayan, Pang Zhonghua and Zou Mubai are all good. In addition, the brush copybooks are sometimes helpful to the writing of pen characters. You can look for this article "How to choose brush copybooks for beginners' calligraphy (with the names of 46 classic copybooks)", which introduces some brush copybooks.