Splendid. Perhaps some gold accents in the background knotwork would help, but seriously I have never illustrated anything much in my life, so that suggestion should not hold much weight. I might also want to look at the story--you have sparked my interest, which is the mark of a good book cover. Keep going.
As I stated on Facebook, you have the skill and attention to detail that makes you characters and creatures stand out like no other!! Normally a scene like this would be in a forest or castle! No with the way you present it, it could be on a plastic jug and till look good!! Its in the flow of it and stunning original look Love it!!