I really like your quilt. For straight line quilting what I do a lot is "bank shot quilting" think of a pool table and shooting the cue ball across at a 45 degree angle then it bounces off the other side and goes on and on... So I line myself up to my sewing machine think of a string from your belly button to the needle that way I can sew a straight line that goes diagonally across the quilt. Then begin sewing diagonally across the blocks. When I get to the other side I turn 45 degrees and sew across again. Continue this diagonal sewing until you have x's on all of your blocks. This makes a nice lattice design of quilting if you want more then stitch in the ditch for the blocks. Just my suggestion I like it because it is fast and east to do. Well easier than trying to stitch in the ditch.