I think it looks fine and your feathers are great! Plus the stitching will 'blend in' more after the quilt is washed and crinkles up. I also have a Juki and haven't gotten up the nerve to do FMQ yet, so you give me some courage to keep practicing. That is another reason to keep going, practice will only improve your skills. I also struggle with thread colors in quilting as I prefer my stitching to blend in, but think yours look great. Any several posts on this board recommend going with light colors on darker fabrics just as you have done. Just keep going and finish it!