very nice. I almost can't believe it's pure bryce :) very nice surface texture on the planet. As for ideas on improving realism, here's some things you could do; I'd make the atmosphere halo much thiner and it should have very little ambience or even absolutely no ambience at all. The visibility of the atmosphere should depend on the light from the star. Bumps on the clouds and shadows on the surface from the clouds help realism too. And then you could try to faking some fresnell effect. Making sure the water has much higher specularity and reflection then the land adds much realism too.

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