Ilanthar, might I suggest something ? By having an unevenness in the paler blue around the coasts, you would suggest shallower waters un particular places. For example, it would look good to further the peninsula movement with this paler blue suggesting that the ocean floor continues a little bit (or that there lies the sunken city of Ys qu'on peut apercevoir au large de Douarnenez quand le ciel est clair et que l'eau est calme ... je m'emporte). Same thing for a special bay where you could have the whole bay in shallow waters (allowing for a good surfing spot). I dunno if you have decided of the tectonics (nothing could surprise me from your awesomeness) but these features would break the monotony of your actual shallow waters and infuse more life in your marvelous piece. Juste mes deux centimes