Looks great, I like how you combined the use of the cloud so it looked like Altair was hiding behind it. Fits very well. Great sig.
Try to smudge the straight edges of the splatter or w/e on the right so it looks softer and not so forced. The dots on the top left were sorta random nice job with the blending and flow :]
kill the splatter in top left and the 1 px dots and you got a wicked tag imho. some dodge/burn may help strengthen the focal as well.
The cloud looking things on the right is my only problem. Otherwise I love it, great lightning and depth.