The last OBW I quilted I curved out from the seams in the hexagon all the way around each of the blocks. It turned out nicely and I didn't have to draw lines to do it. It is sort of a scallop or looks like a flower curving out from the center where they join. I hope my description is clear. I love the diamonds you added - they add another point of interest. Aren't OBW fun, they are always a surprise when you put them together.