By the (apparent) size of the islands in the background, the one in fronts texture need to be scaled down some as well. Looks a little too close by comparison to the others. Then as suggested above, make the reefs fall off a little less sharp. Using a gradual taper into the sea. Perhaps even a reef free standing without breaking the surface somewhere on the right. (kind of like some of the areas around the Florida keys and other islands of the Caribbean.) The idea of a ship would be cool too, or perhaps a seaplane. :)

The doctor says I have way too much blood in my caffeine system.