Editor’s picks | This untitled work by Joan Mitchell dates from around 1960, not long after she began living in Paris. The maelstrom of colour and line reflect a new-found lyricism, inspired perhaps by the city, her tumultuous relationship with the artist Jean Paul Riopelle and a social circle that included Alberto Giacometti and Samuel Beckett Estimate: €3,200,000-5,000,000 18 October, Paris | | | André Derain’s affectionate 1927 painting of his niece, Geneviève, is one of more than 100 portraits he made of her. The daughter of his wife’s sister, she was a baby when she and her mother moved in with the Derains in 1919, and as a child she became an industrious helper, sharpening pencils and cleaning brushes in the artist’s studio Estimate: €30,000-50,000 19 October, Paris | | | Painted around 1954, Winston Churchill’s Marrakech with a Camel has never appeared at auction before. The iridescent study of the city’s ramparts and the Atlas Mountains beyond was acquired in 1982 from Churchill’s daughter, Lady Sarah Audley, by Mary and Benjamin Rummerfield, and has been in their family’s collection ever since Estimate: £600,000-800,000 16 October, London | | | Harlan Estate 1992 is a red wine from California’s Napa Valley, and a favourite among collectors. A classic Bordeaux-style blend of Cabernet Sauvignon, Merlot and Cabernet Franc, it is offered here in three magnums. This was one of the first Napa wines to achieve cult status, and recent tastings seem to justify its exalted reputation Estimate: $4,500-6,500 until 16 October, Online | | | | |