That’s really pretty! I didn’t see mismatched points till I zoomed in really close. You see them because you know they’re there. By the time you have it quilted, washed and dried, i bet it’ll look just right to you. Seriously.
As fir design of quilting, I’m not an exoert by any sttetch. How dense do you want it? If not much, I can see arches from corner to corner to mirror the semi/ circles, then filled in with zigzags or ribbon candy,