http://derived-designs.deviantart.com/art/Strike-116082615 First ever space scape. Hope to make more soon.
That's very good for a first compared to what I've seen. Try not to steer in the direction of using monotonous tones, try adding some variety. If you look at pictures of space, there are a lot of random colors that somehow manage to blend in with each other nicely. Planets and starfield could use more detail. Especially planet textures... On the lower left planet, you have this "beam" of light thats tilted on it... it looks more like you were attempted a shadow, which should just be black and not white. Hope to see more.
First of all, it's too monochromatic. You should give some life in that work, I mean, one colour is good, but in more hues. I see some potential here, so keep it up!