I really love details and colours - yor painting skill is great. But you should work with composing. You may paint awesome stuff, but if you lose composition - you may lose all the points of your work. And on the contraryб умут if you don't have good painting technique, but feel the composition, you will have succes. Specifically in this painting you have large empty field in top-left corner, it makes viewer spread out his attention from the points that you'd like he look at.
Of course, I'm far from professional level and I really don't like to judge such a good works. I wrote this all only because of your critics request.
thank you for your feedback Angotir. In my defense I can Say that I needed to left a large section on top of the illustration to make room for the title of the book, now that you mention it it does look weird. I might crop it next weekend. Thanks again