What I learned when I did a tumbling blocks quilt is keep the light diamonds on top and you've already done that. I think it doesn't look right to you because it's still segmented and once it's together it's going to be a good-looking quilt. Mine was all diamonds; I ordered pre-cut pieces from Paper Pieces.com because I enjoy English paper piecing. It was easy and I liked doing it. Keep going, you're going to be happy with it when it's finished.