Dark Chyld-
You blocked out the completed curves at the right side of the border tile above your own but neglected to darken them, resulting in a poor joint with the tile above. Try to reduce the straight line effect at all known joints by bringing in enough solid color to diminish the impact of the joint line. Even in my own tiles I often have a problem with stitching the quilt together in a first class manner and aside of this small omission, you did fairly well in allowing the continuity to flow at the other borders. In good spirits I offer this observation and am sure that you will make sense of my comment. Have a wonderful time with your tiling... Ed Martin