I like the new sea mask. Close up the vertical jitter on the waves is a bit large and makes them look very spiky, but this gives a great look zoomed out a little, where this just gives them a bit of fuzz.
I'm not too keen on the plus signs, but I'm lost on how to depict reefs. Maybe a line with cross bars on it at regular points and some smaller ripples? Right now the surrounding ripples give the reefs the same status as the coastlines. I'm not sure that's quite right.
As for the dunes, I like it. The stippling is a little black and hard for this map - it's the only thing I can see with an edge that hard. I'd blur it a (very) little. I'd also suggest spreading out the mask E-W to fit the iso view. Currently the pattern has the same dimensions NS as EW which doesn't quite look right.
Otherwise, coming along nicely. Looks good.