I did this cover for a ebook a little while ago. The book is 'The Empty Trunk' by Lily Hathaway. It was a fun illustration to work on, and here is a short description of the book:
Horace and Gregory set out for their annual trip to the circus they
have no idea of the trouble that will come from winning a door prize!
When a mysterious trunk arrives at their cottage, adventure soon follows
as the two friends try to outfox the evil Count who has tricked them
into becoming his allies during an uprising in his kingdom.
You can find the book on Smashwords or Amazon.