Looks good. Don't forget to create hiding places and holes for the fish, they'll thank you for it. A lot of people are just thinking about coral placement, but providing security for your fish will not only help reduce stress, but you'll see more "normal" behavior from your fish. Which is my main reason why I don't like negative space aquascapes, they simply do nothing for the fish and when the corals grow out, you don't see any of that work, kinda pointless in my book, but I'm kinda old school that way. I also like islands or bommies, which kinda breakup the overall look and gives you a sense of depth.