After watching the trailer about 100 times and comparing to underwater videos and photography, I have to say that the cgi is at least 85%-90% on point. It's a bit difficult to nitpick. Something did seem a bit off at first and then I realized that the movie itself looks a bit too neat and clean. Amber is definitely wearing way too much makeup. She looked better in JL. The only other thing is that the trailer music is putting me off. I really hope the official music is good.