Is Cao Ruiqing's calligraphy and painting valuable?

Cao Ruiqing, born in a scholarly family at the beginning, was born in his grandfather and uncle at the age of six. He studied calligraphy in Song, Shang, Zhou, Qin and Han Dynasties, and used calligraphy in Wei, Jin, Sui and Tang Dynasties. At the age of 26, she went to China with a youth cultural exchange group, then lived in Mongolia for 19 years, quietly studied China art on the vast prairie, and she could write calligraphy on 43 parts of her body. His works are rough, simple and vigorous, and have been collected by artists such as Professor Peng Qingyi, Teacher Wang Gang and Andy Lau. He is quite famous, and his calligraphy and painting are worth collecting.