I really like the textures on the floor and wall. How you have the light coming in the window and reflecting off the princess and floor is really good. When I look at this I feel lonely and sad. Good work.
Oh, you should absolutely republish your own version of "The Princess and the Goblin" with your illustrations. Since it's out of copyright, you could certainly do that with no problem. Then you could sell it on Amazon as an e-book, or even a printed version through their self-publishing options.