I have Liu Jianmin's paintings and calligraphy. How is the market now? Is it valuable? How much is a flat foot

I don't know if Mr. Liu is a world-famous artist, whether he has influence in the painting world, whether his circle of friends is rich or expensive, whether he has held art exhibitions, seminars, publications, elegant collections, exchanges and promotion. Are there any political celebrities, business celebrities, celebrities and academic leaders who endorse their platforms? If there is, then Mr. Liu Jianmin's calligraphy and painting market will definitely rise, and it will be expensive. There are thousands, tens of thousands, hundreds of thousands, millions, tens of millions or even billions of flat feet, and we can only look up.