What is the preservation of Zhang Tongjun's calligraphy?

It's ok. It's well written, but it's not very good. This person is very good at marketing himself. There are too many people who write calligraphy well in China, but there are few famous ones, mainly because they don't hype themselves. Zhang Aijun belongs to the kind who can market. Don't think that words are valuable. Most people can get words if they give something.