Most of Cicely Mary Barker’s artwork is still under copyright and so may not be posted legally on the internet. I’ve included here some of her work that is in the public domain (created before 1923).
Elves and Fairies postcard
Children of the Allies
Shakespeares Boy and Girl Series – Mamillius
Shakespeares Boy and Girl Series – Anne Page
Wishing You a Happy Birthday
Dorothy on Shirley Hills
Elves and Fairies Postcard