Ingela Arrhenius is a Swedish illustrator, who specialises in colourful, graphic and (largely) child-focused designs with a midcentury slant.
Looking at her work makes me happy – it's got the sort of joyful simplicity of Charley Harper, and the characters she draws are friendly without being sickly.
Lionface poster, £18 from Hus and Hem (details below)
I featured some of her for-grown-ups