The editing around the moon is very visible. Nice angle and lighting on Ben's face. By the way, to get a good photo of the moon, you probably need to set the AV lower. By default, the camera will expose for the sky, because that's most of the shot. So, drop the Av down to -2, or use manual mode, and you'll be able to get a much better shot of the moon with some detail in it.
This is a great idea with lots of opportunity. You could have used a longer shutter and done some movement on the sabers. That would have been really cool.
Back to the photo at hand... It looks a little soft but the colors and lighting are great. I love the black background with the red and purple sabers on it.
The planet/moon/deathstar really distracts from the image, and 'luke' appears to be freezing, really difficult to believe he would fight 'vader' with his hands wrapped inside his cloak. Its a nice idea, but isn't held together strong enough for me.