First off, I love this quilt, it is fitting for a little princess :D:D:D I love the quilting too!!!
As to the center of the blocks, how far apart can the quilting be according to the label on your batting. Can you do a meandering design around the characters and be within the guidelines?
Stitch in the ditch around the stars would be very pretty :D
Most quilters put the label on last, handstitching it down. There are some though, who will attach it first and them do their quilting.