Your top is coming along nicely and some red stars on the star fabric would look nice. I might do machine applique with a fusible like Wonderunder and "window" (you draw your shape on the paper side of the Wonderunder and then draw a line inside the shape about 3/8 to 1/2 inch and trim away the center of the Wonderunder before fusing it to the back of your fabric) so the center stays soft. A nice buttonhole stitch or similar to finish the fused edge of the stars.