I wouldn't trapunto the quilt, but I might echo quilt around the star and into the center of the stars. (remember, the largest reason to quilt is to anchor all the layers together. Depending on your batting, your quilting has a recommended distance you have to quilt within, anything bigger or looser than that will cause your batting to start traveling around)
In the light areas, the "flow" seems to BEG for feathers ... (not double sides feathers, mind you) ... but simply a half sided feather that sort of echoes the star ... have no way to show you what I mean ...
when I look at your quilt, I don't necessarily see the straight lines of the stars, but the lights in contrast, seem to almost be rounded - - it is an optical illusion, and I would think it could be used just to soften the straight lines in your stars.
I think trapunto would make the star look lumpy <wave>