You should be proud of your piecing! That's a gorgeous quilt! I would find a pattern (any pattern, but perhaps some feathers for the plain blocks). Reduce or enlarge the picture to the exact size you want, pin to the block you want to do & sew the pattern right over the paper. Dampen the paper at the stitch line & pull off the paper. Your quilting will look wonderful & it'll be good for your muscle memory for future endeavors of this nature. :-)