Zhao Chengan is a well-known calligrapher, and his works have certain popularity and value in the market. However, specific to the value of a work, we need to consider the above factors. If a work is well preserved, the market demand is great, the artist's popularity and the historical significance of the work are high, then its value may be higher.
Moreover, the value of calligraphy and painting depends on many factors, including the artist's popularity, historical significance, preservation, market demand and so on.