Is the set of calligraphy and painting by Liu Jian, a military calligrapher, valuable?

This work is obviously inspiring, and it is still very good. It's hard to say whether value is valuable or not, because value is influenced by many factors. What you sell now may be different from what you sell in the future.

It must be valuable, but how much it is worth is sometimes a question. Dozens are money, hundreds are money. If you have high expectations for the author and his works, then you should pay attention to him and support him. Collecting his works is a support for him and a driving force for his artistic development. Once one day, he becomes famous in the field of calligraphy, the price of his works will not be the same as today.