I like the sky ^^b
You should try to:
1 Smudge a little Lelouch's edges. Smudge Tool at intensity 1 or 2 will do
the trick.
2 The snow is pretty unrealistic. Try to use brushes from here or here. (click download in the left, then you can manage yourself)
3 Use white outer glow on the moon, to make it look more realistic.
4 Don't put too many snow flakes over the guy!
5 Something about the trees... maybe smudge the a little bit...
6 Make the text more dramatic... like his pose. A Century Gothic font, white
colored and with a small black outer glow & low opacity can create the effect quite well.
Hope this helped ^_^