Your quilt is beautiful!!! I love the blue and you have executed a wonderful blue quilt. Great design and great job!! I took a class a few years ago and the teacher said the one thing no one in her class should do is use different shade of the same color -- that waved a red flag in front of me so I choose to do mine all in blue. She was amazed how nice it turned out.
Your choice of colors to produce the shading is simply wonderful -- again great job!!