John Ronald's Dragons: The Story of J.R.R. Tolkien by Caroline McAlister

From Macmillan:

John Ronald loved dragons. He liked to imagine dragons when he was alone, and with his friends, and especially when life got hard or sad. After his mother died and he had to live with a cold-hearted aunt, he looked for dragons. He searched for them at his boarding school. And when he fought in a Great War, he felt as if terrible, destructive dragons were everywhere. But he never actually found one, until one day, when he was a grown man but still very much a boy at heart, when he decided to create one of his own. John Ronald's Dragons, a picture book biography by Caroline McAlister and illustrated by Eliza Wheeler, introduces the beloved creator of Middle Earth and author of The Hobbit and The Lord of the Rings to a new generation of children who see magic in the world around them.