Is regular script good in European style or good in facial style? I like Tian's calligraphy very much. I wonder if you have any opinions to share?

Learn facial style. European characters are too difficult for beginners, because they have great rules and strict barriers, and beginners will be confused when they learn them. I suggest that you have a certain understanding of regular script before studying, which will be better. But the key is what kind of books you like, and then study. You can watch more lectures on Tian calligraphy online when you have time, which is very good.