First of all I love the idea you are working with here, and so far it is looking great.
I think the biggest problem that you are having is that the two halves (top and bottom) seem very detached from each other. Unfortunately the stream of stars is not doing enough to tie the two of them together. The bottom half has a lot of depth and diveristy of color in it. It is also in not completely in focus.
While the top half is very flat, and few colors are used. Which is not a bad thing. But if you want to add to the depth of the shot I think you should try to excentuate how massive the bird is. Try playing with the back wing fading into the distence by fading it in some, and blur it out a bit. And the front wing can be brough out by making it brighter than the head.
The trail of stars that connects the two light sources is a little confusing as well. I don’t understand why it changes from blue to white to red.
And what is the light source that is causing the moon lighting/lens effect? Is that not the sun that we see in the bottom of the picture? It feels like that was thrown in to add a (very overdone) star trek effect. If the picture does not suceed to your likings without it, I would at least try to mimic the lens effect to that of the lower suns. If this were an actual photograph I would think that both light sources would affect the lense in similar ways.