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Wiktionary
life class

n. (context arts English) A teaching session in which art students practice drawing or painting the human figure using a live (often naked) model

WordNet
life class

n. an art class using a live human model

Wikipedia
Life Class

Life Class is a novel by Pat Barker released in 2007. The novel is about students at the Slade School of Art in the first years of the twentieth century, one of whom volunteers to serve in a front line hospital during the First World War.

David Boyd Haycock's A Crisis of Brilliance: Five Young British Artists and the Great War (Old Street Publishing, 2009) presents the remarkable "true story" that lies behind Barker's novel.