Beautiful work. Love the colors. As a critique, it seems rather cramped. Perhaps you could widen the view to include the top of the peak, the end of the unicorn horn, the wings of the winged rider, and the rest of the wing of the horse/pegasus?
Merely a thought, and not even sure it's possible at this stage.
Thanks for your comment and your thoughts. I played with the composition and decided to bring it all close to the camera. In that way the action is closer to the viewer. But perhaps the landscape could be a bit 'wider'. Well, everyday I learn new things. Thanks again for your critique!