1. Authenticity of the work: If it is an original work written by Tang Xianlong, and it is identified as authentic, then 200 yuan is not expensive.
2. Artistic value and collection value of the works: If the calligraphy of the works is artistic or has certain collection value, 200 yuan is also a reasonable price.
3. Preservation of the works: If the works are well preserved and there are no problems such as damage and fading, 200 yuan can accept them.