You should get some pictures from google images to use as reference. You're getting there, but there is a lot more that you can do. There are highlights that can be added to the water, some little details to make it less boring as well such as rocks on the land and maybe add some grass shooting out from the land.
It's hard to give pointers right off the bat. But a lot of anti-aliasing needs to be done. Perhaps you should sprite a scene and I'll give you some critique from there.
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