In the gloomy splendour of Drumlanrig Castle in Dumfriesshire, the 10^th Duke of Buccleuch gazes up at Rembrandt’s Old Woman Reading, 1655. The painting has belonged to the Scott family for more than 250 years, and like generations before him, the duke has known it all his life. “She is the most powerful presence in this house.” He pauses: “Do you see what I mean?”

Picasso and Paper, Royal Academy ★★★ A fascinating subject that proves too unwieldy for a single exhibition. Until 13 Apr

“Gauguin was undoubtedly self-obsessed” begins the National Gallery’s latest dead cert blockbuster, as it cheerfully hijacks a de facto series begun next door at the National Portrait Gallery.

When in 2004 Frida Kahlo’s bedroom – sealed on the command of her husband Diego Rivera for 50 years from her death – was opened, a trove of clothes and personal items was discovered.

The well-known portrait of New Zealand’s greatest writer, Katherine Mansfield, is exactly 100 years old on 17 June 2018 (main picture). It was painted by the American artist Anne Estelle Rice.

In his 1991 novel Mao II, Don DeLillo called the literary medium “a democratic shout”. His oft-quoted claim is that any man or woman on the street could strike it lucky, find their voice, and write a great book. Not only does everyone carry round a novel, but those novels are potentially brilliant. Well, it’s not a Pulitzer nomination but in Brighton right now, any ordinary Joe can walk in off the street and find their art put on the wall at the city’s foremost gallery.

Painted in ice-cream shades punctuated with vivid red, the series of portraits made by Picasso in the early weeks of 1932 are as dreamy as love letters. His mistress Marie-Thérèse Walther – we assume it is she – lies adrift in post-coital languor, her body spread before us as a delicious and endlessly fascinating confection.

It is a very human crowd at Victorian Giants: The Birth of Art Photography. There are the slightly melancholic portraits of authoritative and bearded male Victorian eminences, among them Darwin, Tennyson, Carlyle and Sir John Herschel.

Mortality inflects commemoration. So it is with portraiture: the likeness – particularly those which celebrate lives of status and accomplishment – will always be limned with death.