A runway and a PBY? Or an old sailing ship with a pirate flag? Maybe a bit more color on the water like greenish coral reef stuff. Great image though.

White foam or waves on the shore and possible some spikes for tree vegitation otherwise great work! What material did you use this is really good?

I too like the material - nice... The improvement that I'd make is that the terrains end underwater apparently where the lighter blue color turns into deeper blue. This should be a much more gradual fade. There are some coral reefs that end that abruptly, but probably not that many in that kind of a configuration around islands... Good work!

This is very cool! How about some birds in the foreground? Or in the distance?

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. :)

I second what RimRunner said. Good texturing on the two islands in back. The furthest one looks quite legit.

woohoo! birdies! Looks very good. Can we all go exploring?

Now you just need a tuna boat with a helideck. Reminds me of fish spotting in the Solomons or near Marjuro, or Baker/Howland island, or Centani Indonesia, etc.