How much is Zhang Wenyou's calligraphy?

Zhang Wenyou, Zi Defu,No. Jingsheng, from Xiangcheng, Henan, 1970, member of China Calligraphers Association. He made in-depth research on Kai, Xing, Cao and Li, especially on Li, which was unique in Wei and Jin Dynasties. His works have won the first national youth calligraphy seal cutting award, the finalist award of the national "Xinglin Cup" TV calligraphy competition, and the third national calligraphy Lanting Award. Many newspapers and periodicals at home and abroad have special editions.

How much is Zhang Wenyou's calligraphy worth? How much is it exactly? Mainly depends on the stage of the work, the size of the work, the number of seals on the work, the difference between seals and so on!