Just a caution, not sure from your post if you have done complete tops, or practice pieces. I would make sure you are completely comfortable with FMQing a 60" quilt and not 'practice' on this one. That top is just stunning!
What batting are you using?
As far as the quilting design goes, I would do a combination of SITD and stippling. For instance, SITD the serpentine/flying geese border (not the geese themselves, just around both sides of the the purple border). I would also SITD around the main star and the outside of the B&W new York beauty squares. I would stipple the blue background, this, with the SITD, will make the serpentine border puff a bit. I'd continue with the SITD/Stipple, stippling the areas you want to recede and SITD with no fill the areas you want to be raised. I'd also use different color thread, matching the thread to the area you are stippling. I would want the piecing to be highlighted rather than the quilting.