Wow.. I've always had a thing for space art.... although jso037 did make a point, but it's quite okay, without the detail it makes it more dreamy than relistic... which i like...
Very quiet, self-reflective piece. I like it. However, it would be cool if you added some more detail and personality to the moon itself--perhaps something to make the craters appear more 3D...
The only thing perhaps you can do is to add a bit bumpiness to make it more realistic, I guess
Great job!