well if its a lava land, you need vapours, and maybe a very thin atmospher. I understand its space so might not be much atmosphere on your planet, but its still realistic for vulcano's to spew fumes of some kind. this would also let ice melt, so some watervapour would also be there. For the snow, maybe.. try a but of texture rather then just one color. also the shape of the surface does a lot sometimes. maybe longer whispier shapes work better? The muddy ground could do with some more variation and texture to make it look less muddy. for the stars, google greg martin's star tutorial ;-) the mountains dont look distant due to lack of haze. the squareness could be solved by more variation in elevation. lava: check out pidjy's tutorials. they should be somewhere in the forum archives.

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