Editor’s picks | ‘One of my best’ was Dante Gabriel Rossetti’s verdict on his Portrait of Mrs Charles Howell, an 1869 study of the Pre-Raphaelite muse Kitty Howell. Her husband was a notorious rake and conman, who infamously persuaded Rossetti to exhume his late wife Elizabeth Siddal in order to retrieve the poems he had buried with her Estimate: £500,000-800,000 4 June, London | | With a constellation of old and rose-cut diamonds in a gold and silver setting, this star brooch is a scintillating statement piece. It also has a stellar pedigree, being offered in the original box in which it was presented by its 19th-century makers, the Paris firm of Rouvenat & F. Després Estimate: CHF 7,000-12,000 until 29 May, Online | | Garfield, Bart Simpson and Pikachu are among the cartoon characters to have figured in the work of Katherine Bernhardt, but the Pink Panther seems to be a particular favourite. A contorted version of the famous feline takes centre stage in her large-scale 2019 painting The Acrobatic Dance, surrounded by crocodile heads Estimate: HK$300,000-500,000 28 May, Hong Kong | | The work of a towering figure in modern Chinese painting, Arc de Triomphe, from 1993, is a true one-off. Wu Guanzhong sketched the original on a visit to Paris in 1989, but when the drawing was later damaged, he photocopied it in black-and-white, then added colours to complete the picture Estimate: HK$300,000-500,000 31 May, Hong Kong | | Browse Auctions | |