Very nice top! I would say that the top is too busy for a pounce type stencil. I use a blue wash out pen for the lighter fabrics (after testing each one!) and a Clover white ink pen for the black. In your case here, though, I would just straight line quilt a qtr inch in down each light row to make an open grid. That would highlight the piecing more than a meander and would be much easier.