Just to add my bit - you need more petals, and the leaves would fit between as well as on top of the petals.
( and I had to play with the drawing )
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She appears to have just the templates. There are four flower petals as you have shown, but they are topped by a second set of smaller petals. Each of four leaves fits directly under the heart petals, almost like your bottom petal. Your center circle should be a tad smaller to allow more room for the double petals. The antique block is named Rose Of Sharon and Ohio Rose of Sharon. According to works by Nancy Cabot it was originally designed by a lady in Ohio. I had previously posted a picture of an actual antique block but someone deleted the post saying it violated copyright laws, but I have no idea how it could have. I am still looking for my quilt top I made and surely it should be ok to scan that and post it!