Red lotus would stick out like a sore thumb IMO. I would readjust the DW a bit more and get it to poke through more. The one in the middle back pointing to the left does not match the flow of your setup. I think thats where you lost your center. Other than that though, I like the plant choices alot. Simple, elegant and lush.
I there were any plant I would add it would be something with a softer coloration, not bold, perhaps Golden Nesaea.