Briefly describe the artistic features of Yuan Sijia.

A: (1) Huang, Zhenwu, Wang Meng and Ni Zan, also known as "Yuan Sijia", had the greatest influence on later generations in the middle and late Yuan Dynasty.

(2) "Yuan Sijia" is a scholar in Jiangsu and Zhejiang provinces, who is good at painting landscapes. His works are bamboo and stone, emphasizing the organic combination of poetry, painting, calligraphy and printing. Their works belong to typical literati paintings. Although their painting styles have their own characteristics, they all learn from Dong Yuan and are influenced by Zhao. They attach importance to pen and ink, pay attention to interest, and combine calligraphy and poetry. They are the mainstream of landscape painting in Yuan Dynasty, and have a great influence on painting in Ming and Qing Dynasties, especially on "Nanzong" painting school. They attach great importance to ink painting in form, or their colors are slightly pale and crimson, forming different faces (such as Huang's wealth and Ni Zan's seclusion), but their emotions are mostly sad, indifferent and lonely, reflecting the helplessness in the turmoil of the times.