It's a cool portret of a dragon. I read in the description that you made the empress design yourself? that's pretty awesome. The view is simple, a side view. may add a little more action in the pose. Also I would do the background another color. you see, both dragon and background are blue. can be a little confusing.
you did a good job on the coloring itself. oh and the eye could use some shadow and lighting part. But ofcourse I don't know what KIND of commission this was so maybe I am all wrong.
anyway you did a good job!