I applaud your efforts, that's a big project for sure. I have only one complaint, and it's just my own opinion. I would have chosen black for the the background. It's space, and to me blue is, well.....the ocean. But that's just me.
Another thing that I would do, and you can add this to blue or black night skies...put some stars out there in space. You don't need a lot. Put a few dots of light, or a lot. Whatever you feel.