I'm not an expert, but I would draw a pattern on the squares with the 'blue marker'. It will wash out when you wash your quilt. One of your pieces has a blue rose in the fabric. Try using that as a pattern. Use a lighter blue thread to quilt and have your quilting (circles) spaced evenly apart. One of my machine quilting teachers told me that a Circle defines a feminine quilt and a straight line or square defines a male quilt. These are just my thoughts. Eiltcoq.