Hi, great job on the quilt top - it looks lovely. When I see as much light open areas as you have there I always think of a pattern that would be highlighted nicely there. There are so many wonderful pantograph design out there for edge to edge or just blocks that I would be tempted to do one of those. Or there are also alot of stencils out there to do "pounce" with that could really set off those great spaces. Have you ever tried a pounce pad with fine ground cinnamon in it for the light colored fabrics. I went to a longarming class and the instructor showed me that she has a separate pounce pad filled with cinnamon for pouncing on light fabric. After she pounced it and quilted that area the cinnamon brushes off very easily.
Hope this helps.