Vanessa Bell: A World of Form and ColourThe subtle and sensitive paintings of this Bloomsbury Group stalwart prove modernist art doesn’t have to be explosive to be interesting. • National Gallery, London, until 2 FebruaryMałgorzata Mirga-TasPainterly group portraits that are actually textile collages by this Romani artist, who works in her village in Poland as a community activist as well as artist. • Tate St Ives, from 19 October until 5 JanuaryPass Shadow, Whisper ShadeGroup show that takes its poetic title from an Irish proverb. Sign up to the Art Weekly newsletterIf you don’t already receive our regular roundup of art and design news via email, please sign up here. Get in touchIf you have any questions or comments about any of our newsletters please email newsletters@theguardian.com