I would like to learn something about face reading and people's inner self (character, mind, psychology, healthiness), are there any books about it?

Ma Yi Shen Xiang (麻衣神相)

神相铁关刀

神相全篇

相理衡真

《柳庄相法》

《公笃相法》

《水镜神相》

If you are a beginner in the art of physiognomy, it is recommended that you look at Shao Wei-Hua's books on physiognomy.

"Palmistry and Face Reading Know It All (Graphic Edition)" is a compilation and analysis of the contents of the ancient Chinese canonical writings, folk beliefs, and arts and mathematics related to the Chinese mystical culture, and the composition of the entries includes interpretations, brief descriptions, and quotations from the ancient texts. This provides a general outline and clues for the study of the phenomenon of Chinese mystical culture. With a large number of vivid and lively texts and exquisite pictures, The Complete Knowledge of Palmistry and Face Reading (Graphic Edition) shows readers the origins of the development of ancient physiognomy as well as stories and legends related to physiognomy from multiple angles, which makes for a fascinating read. In addition, Palmistry and Face Reading (Graphic Edition) demystifies and reflects on the methods and social efficacy of ancient physiognomy, so that we can understand physiognomy more objectively and break down the prejudice and superstition of physiognomy. The basic knowledge and the most practical parts of palmistry and physiognomy are presented in the most concise way, so that we can learn physiognomy without being confined to obscure ancient texts.

Highly recommend this book, I have read and practiced it quite accurately.

I hope it helps you.