Well I think it could use a little more light. When doing it "realistic", sure, the only source of light would be the star with maybe a few deflected rays from the planet here and there. But since realism is dull (and you have not gone down that road anyway, since the lighting of the planets doesn't fit the position of the star) I'd say: more light.
You have that nice background with orange and reddish colors. Put some ambient light in the scene to reflect that. Maybe also some blue or purple'ish bits ...
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You have that nice background with orange and reddish colors. Put some ambient light in the scene to reflect that. Maybe also some blue or purple'ish bits ...