What can I really say?
You've made a stencil from a circle, have coated it heavily in blue and, while there are background colours to the earth of green and white, it's not something I can really give marks to for artistic merit, if I'm entirely honest. The moon looks basic as well, the only detail coming from three pinpricks, which make the piece reminiscent of a bowling ball, as opposed to an orbiting satellite. Perhaps making some stencils to add detail (continents, or the moon's larger craters) would have helped here?
The background isn't anything special - like you've sprayed the background black and then thrown a few colours at it willy nilly, to attempt to portray stars. For me, this doesn't work - the colours are wrong and they are far too close together.
Regarding your response to the review below, the lighting for me takes away from the realism, destroying the illusion. Space itself does not reflect light, it would just be black. The Earth and moon would reflect the light, so there is an issue there, which this image is not done justice to.
[Review Request Club]