Hilda Cowham (1873-1964) English illustrator, famous for her work on children's books and ceramic nurseryware.
Nell Brinkley (1886-1944) American illustrator and comic artist who was sometimes referred to as the "Queen of Comics" during her nearly four-decade career working with New York newspapers and magazines.
Muriel Dawson (1897-1974) Born in New Zealand to Scottish parents, but moved back to the UK in 1913. She illustrated a number of books, and contributed hundreds of covers for weekly magazine Woman's Pictorial.
Joyce Lankester Brisley (1896-1978) English writer. She wrote and illustrated the Milly-Molly-Mandy series, which were first printed in 1925 by the Christian Science Monitor.
L. Kate Deal I cannot find any information about her, except "a published author and an illustrator of children's books."