Did you draw the Earth/Moon by 'hand'??? But in the future, I suggest getting real pictures of space from like Google Images or something. It will look much better that way, as long as you do a good job, and this is pretty good.

Not bad for a first try. I reccomend using the "vivid light" brush modifier. When you paint over a color a second time is goes from just dull color to brilliant light. It's great for lasers and engine flares. :)

Just wondering, How old are you?.