um, sillymoogle... I'm a guy...
Anyways, a quick critique.
These are the areas I think could be improved.
---Asymmetrical balance: It's a little too light on the side with Kizna. To better balance, try adding another light object on the right side. Maybe a planet, moon, a large galaxy or the space station.
---Emphasis: I'm going out on a limb and saying the middle portrait of Kizna. This is where my eyes go to because it's in focus and easier on my eyes to rest. I think the Kizna in the foreground is supposed to be the focus. However, its so light that it looks out of focus. If using the level adjustments... I would focus more on the raising the level of the mid-levels.
These are just suggestions on how to improve this wallpaper. Hope it helps.