Hail the Dark Lioness (Somnyama Ngonyama in Zulu) is a powerful celebration of black identity. These dramatic assertions of selfhood are more than just striking self portraits, though.

"The true artist helps the world by revealing mystic truths” reads the neon sign (pictured below right) welcoming you to Bruce Nauman’s Tate Modern retrospective. The message is tongue-in-cheek, of course. How on earth could an artist cope with such a ludicrously unrealistic expectation? 

The screen is filled with the head and shoulders of a man lying on his back; he could be dead in the morgue or lying on the analyst’s couch. He doesn’t move (it’s a still), but we hear his voice recounting the terrible story of the day he accidentally killed his brother. 

Notable anniversaries provided the ballast for this year’s raft of exhibitions; none was dead weight, though, with shows dedicated to Rembrandt, Leonardo and

Soaring some 40 feet up towards the ceiling of Tate Modern’s vast Turbine Hall, Kara Walker’s Fons Americanus looks ludicrously out of place – like a Victorian interloper within this cathedral to contemporary art. Resembling those monuments you walk past without giving a second’s thought to what they represent, this intruder isn’t just in the wrong place, it is broadcasting the wrong messages.

At their best, Olafur Eliasson’s installations change the way you see, think and feel. Who would have guessed, for instance, that Londoners would take off their togs to bask in the glow of an artificial sun at Tate Modern. That was in 2003, when The weather project transformed the Turbine Hall into an indoor park suffused with yellow light.

The times they are a-changin’. On show at the Barbican is a retrospective of Lee Krasner’s stunning paintings and, for the first time ever, Tate Modern is hosting two major shows of women artists. At last, the achievements of great women are being acknowledged and celebrated.

Tate Modern’s retrospective of Dorothea Tanning is a revelation. Here the American artist is known as a latter day Surrealist, but as the show demonstrates, this is only part of the story. Tanning’s career spanned an impressive 70 years – she died in 2012 aged 101 – but as so often happens, she was eclipsed by her famous husband, German Surrealist Max Ernst. 

Franz West must have been a right pain in the arse. He left school at 16, went travelling, got hooked on hard drugs which he later replaced with heavy drinking, got into endless arguments and fights, was obsessed with sex and, above all, wanted to be an artist but hadn’t been to art school. His life reads like a bad novel or Hollywood’s idea of the tortured genius struggling to make his mark in a world indifferent to his talents.

“Slow looking” is the phrase du jour at Tate Modern, an enjoinder flatly contradicted by the extent of this exhibition, which in the history of the gallery’s supersized shows counts as a blow-out.