Hunterian Art Gallery, Glasgow, until 4 January 2015 The Charles Rennie Mackintosh exhibition at Glasgow’s Hunterian is sadly timely, given that the designer’s masterpiece, the city’s art school, suffered horrendous damage by a fire this year. But such a show is well overdue. It’s the first comprehensive survey of the acclaimed Art Nouveau architect and, as well as his most famous works like the school, his fine domestic buildings can be appraised in detail in the show through drawings, models, archive material and new film works.

Royal West of England Academy, Bristol, until 14 September 2015 In an article in the last issue of RA Magazine, painter Hughie O’Donoghue RA discussed some famous images of the First World War by the British artist Paul Nash. Paul was not the only Nash to be an official war artist; his younger brother John was also a poetic landscape painter, although he trod a more traditional path while his sibling experimented with avant-garde styles such as Surrealism. At the Royal West of England Academy from this week, rarely seen works by both brothers are brought together.

White Cube Bermondsey, until 14 September 2015 British sculptor Rachel Kneebone makes extraordinary works in ivory-white porcelain in which Rodin-esque human bodies – often dismembered or disturbingly in flux like out-of-control stem cells – merge together with an almost Rococo sense of formal flourish. Her largest work to date, 399 Days, on view at White Cube, takes this overabundance to another level by soaring up to the ceiling in a towering form inspired by Trajan’s Column.

Jerwood Gallery, Hastings, until 15 October The success of an art competition relies on the talent of its judges, both to encourage submissions and, of course, to ensure the best are selected. The Jerwood Drawing Prize – 20 years young this year – acknowledges the high standard of its selectors over the years by presenting an exhibition of their work. Many of the artists include Academicians, from the sculptor and installation artist Cornelia Parker RA to the figurative painter Timothy Hyman RA.

Various London venues this weekend If there was ever a weekend to go around the capital’s commercial galleries, then it is this one. There are so many great shows that are finishing this weekend. My recommendations include a slew of RAs’ shows: Sean Scully at Timothy Taylor, Phillip King at Thomas Dane Gallery, Jenny Saville at Gagosian Gallery and Phyllida Barlow at Hauser & Wirth. I have also been tipped off by a colleague about the work of artist Susan Einzig, whose lyrical landscapes, portraits, still lifes and pen-and-ink illustrations are on view until Saturday at Fulham’s Piers Feetham Gallery.

Sam Phillips (@SamP_London) is Editor of RA Magazine.