Is Li Zhengtian's handwriting not afraid of difficulties and valuable for collection?

Yes Li Zhengtian, professor of Guangzhou Academy of Fine Arts, researcher of China Academy of Management Sciences, director of "China Post-modernism Institute", and senior consultant of art appraisal and evaluation committee of art service center. His paintings and calligraphy works have been sold and auctioned many times, which has high collection value. Li Zhengtian is a calligrapher, a famous oil painter and a native of Linyi, Shandong.