Did you hand applique these? I bet it's a gorgeous quilt. First thing, of course, is to do an outline stitch around all the leaves, flowers, stems, etc. Then, I'd go with an echo of the outline a 1/4" around the outside of the motifs to set the applique apart from the background quilting. Then you could either cross-hatch or stipple to fill in the background. It looks like there are feathers in the half-triangles under the baskets.