Answer
**Artifice**, according to Renoir, was lacking in Pissarro's depictions of the "common man". Renoir believed that Pissarro's paintings, while technically proficient, lacked the emotional depth and authenticity that he felt was essential in capturing the essence of everyday people. Renoir sought to imbue his own works with a sense of warmth and humanity that he felt was missing from Pissarro's more objective and detached style.