When that happens to me I take off a few hours, and then realize that my mistakes is what makes the quilt a one of a kind. Think of yours the same way and know no one else even at a show will have made the quilt the same way you did. I like what I see. Be frustrated for a day, find a quiet place in yourself, and if you want, try it one more time. If not remember that makes that quilt one of a kind, which is always a good thing.