How high is Zhang Genjian's painting and calligraphy level? How much is the first class? Find a checkpoint.

This can't give you an accurate price. After all, the price of art involves many aspects, including appearance, difficulty, creative content and so on. Some are smaller, more difficult to manufacture, but more expensive. Just like the works created by artists this year, the prices of works created next year will definitely be different. I suggest you further cooperate with professional organizations.