I did a McCall's pattern with those exact flowers. They are a dickens to create because you have to shape each petal of the flower individually. I ended up buying a floral yo-yo maker & going with smaller sized flowers because I didn't have the patience to gather up every petal individually across the entire quilt. Still, the first one I made was truly beautiful. Wish I kept a pic of it to show you, but they definitely do stick up quite a bit from the quilt. My niece, who was 1 at the time, kept trying to "pick" the fabric flowers off the quilt so I had to tack the edges down. You definitely will get plenty of dimension with the flowers. The only part that I stuffed was the center (put a little bit of poly stuffing in to give it dimension). The petals were fine on their own. I think on this quilt, though, it looks like the center is just embroidered so you shouldn't need any fiber fill at all.