Camille Silvy may be the least recognised of all the great photographic innovators of the 19th century. After a decade of almost ceaseless technical innovation, and astonishing output as the society portrait-photographer of the 1860s, he abruptly closed his London studio, aged only 34, returned to France, and, after a brief stint in the garde mobile in the Franco-Prussian War, spent much of the rest of his life in and out of asylums.

What a troubled life Alice Neel led. The death of her first child, a daughter, who died of diphtheria in 1928  just before her first birthday; another daughter lost to her estranged husband’s family in Cuba two years later (as an adult and a mother herself, the daughter, Isabetta, committed suicide); life as a single mother raising two later sons on welfare in the slum district of New York's Spanish Harlem; and a neglected but always diligent artist for much of the rest of it, only achieving fame and acclaim towards the end.

Aptly, this new documentary about how the Rolling Stones fled from England to the South of France to record Exile on Main Street was premiered at the Cannes Film Festival, with a supernaturally healthy-looking Mick Jagger on hand to give it a promotional shove. Jagger (along with Keith Richards and Charlie Watts) produced the film, working closely alongside director Stephen Kijak to knit together an evocative and emotional portrait of "the greatest rock'n'roll band in the world", at what many would argue was their peak.