During the 1930's she attempted to publish volumes of illustrated children's verse, but it was only from 1941, with her long association with Enid Blyton, that she succeeded as a writer and illustrator. Her illustrations for Blyton's 'Famous Five' in particular have fired generations of children. Inspired by the appearance of badgers in her garden, Eileen Soper produced 'When Badgers Awake' which in turn instigated her second career as a wildlife artist. She was a founder member of the Society of Wildlife Artists and elected to the Royal Society of Miniature Painters in 1972. The estate and copyright of Eileen Soper are now in the care at the Chris Beetles Gallery who regularly exhibits her work. A portrait by Eileen Soper of Olympic Gold Medal winner Eric Liddell is in the collection of the National Gallery of Scotland.