Wow, quilting turtle, your center is preettyyy! I think it looks just fine the way it is. That being said, I also think it would add something to it to do some applique to enhance it. I think that if you want to do it, go for it and simplify what is suggested for the applique design. If you don't want to do the applique, the center is beautiful without it.
I'm sure I didn't help you any........ :wink: