Is Chang's calligraphy and painting valuable?

Chang's calligraphy and painting are very valuable. He is often one of the 100 young and middle-aged cultural celebrities in Shaanxi Province. Signed artist of CCTV Painting and Calligraphy Channel, director of China Calligraphers Association. His related artistic attainments are very high, and his calligraphy and painting are very rare and valuable, which is a rare treasure in the market.