Tropic Space Scape

So lets have a look on this pic <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" title=" (Smile)" />

First of all ,great impact here from the thumb and the picture in larger view. Colors and composition are classic and good.
Maybe a 90° horizon is not too exciting but it works here in combination with the planet.
However the planet and the whole sky are an issue here. They look flattened in their height dimension. Like scaled to 70 % height and 100% wideness. The aspect ratio is out of sync here what leads to my rating because thats a mistake that shouldnt be done and can be avoided easily when one is capable to make such a spacescape.
The reflection on the water turned out nice, even though I miss the middle very bright light in the middle of the sky. It doesnt seem to appear down there.

I just read that you made the waterscape with bryce. In case you put in the sky as a picture plane just check the aspect ratio settings under details of the plane and set height and width to 100 % or corresponding values (50 and 50) ,its important to keep them the samee to avoid distortion as we see here.