When looking at these comparisons, two things pop out to me. First the effect of a
full moon hides many of the stars and lightens the sky. Second, the
seawater is greatly brighter and contrasted in close proximity, and where the moon (or other very bright lights) reflect in the distance.
In game, the surf does a great job of showing up like reflected waves.

I just wonder if there could already be a
layer of the seawater texture that would allow for reflections to appear at different
areas of the bump map. If so, maybe this would be a less tedious request or hopefully rewarding area to tweak.