Show at S|2 gallery in London is part of growing trend to revaluate and promote female artists

Competition is stiff for confirmed works, but buyers also gave a nod to quality

Work was precursor to painting that fuelled rumours of Surrealist’s sexual attraction to Ana María

Choice works by less familiar names go under the hammer this week

Rare outing on the market for a landscape by the German artist best known for his abstract paintings

Paddle8 announces it has an investor to lead buy back from parent company

Our pick of highlights from this week's fairs and auctions

A 2014 sale of photographs from the non-profit's collection set an auction record

Weak pound and successful museum shows means increased audience for Post-war American artists

State has 30 months to buy newly discovered work hailed as a “national treasure”<br> <br>

The object, owned by one of China’s longest serving emperors, sold for more than 20 times its estimate

Our pick of highlights from this week's auctions

The double-sided work, valued at €15m, depicts Saint Sebastian on its front and optical studies by the Old Master on the reverse

Major surprise was last-minute withdrawal of Goya sketch at Christie's

New England grad student found the gem in a bag of clams he bought for $25

The head of postwar and contemporary art has presided over the category’s explosive growth

Tefaf New York proved there is life in the market—can this week's sales do the same?

Market see upswing as buyers' confidence grows

Poet's lover Paul Verlaine shot at him with the weapon in 1873 but only grazed his wrist

Fewer trophy works this season, but solid totals and record prices for several artists

The Group of Seven artist, a favourite of the comedian and collector Steve Martin, hit his peak at Toronto sale

Growing Asian purchasing power precipitates alterations to sales calendars

Our pick of highlights from this week's auctions

Young star Njideka Akunyili Crosby’s work fetches more than $1m, ten times previous record

But mixed results at the Impressionist and Modern Art sale in New York reflect continued cautious market

The hammer total was below estimate, but met the auction house’s modest expectations for “a contracted market”

Post-war and contemporary evening auction sees several big sales but still falls short of last year’s total

Solid results for Sotheby’s in first sale after Trump's election victory, but László Moholy-Nagy gets the only artist record

Musician collected unfashionable works by British artists as well as Basquiat and Tintoretto

Heirs of Hungarian baron are selling Beaching a Boat, Brighton