UPDATE: Well.... What do you think?

Yes I agree, Perhaps a blue backing would be nice . I've used flannelette as a backing, which I believe is called flannel in the US, and had no problems. It makes the quilt cuddlier on cold nights. I did prewash the flannel of course...but didn't toss it in the dryer which usually makes it softer which is nice, but it ends up looking used... Just my experience. You've done a wonderful job. I went back to your earlier photo and your changes made all the difference. Lovely choice of,fabrics...