Famous painters included Ni Zan and Dong Qichang, as well as the Four Masters of the Ming dynasty, Shen Zhou, Tang Yin, Wen Zhengming, and Qiu Ying. They drew upon the techniques, styles, and complexity in painting achieved by their Song and Yuan predecessors, but added techniques and styles. Well-known Ming artists could make a living simply by painting due to the high prices they demanded for their artworks and the great demand by the highly cultured community to collect precious works of art. The artist Qiu Ying was once paid 2.8 kg (100 oz) of silver to paint a long handscroll for the eightieth birthday celebration of the mother of a wealthy patron. Renowned artists often gathered an entourage of followers, some who were amateurs who painted while pursuing an official career and others who were full-time painters.