The night vision look does add a little big of spookiness to the image, especially with those eyes and that wide grin. Nothing really to improve on as I believe what you have is probably the exact effect you were going for.
Huh, not really sure what to say. I don't really get the efeect of a alien, just an girl friend who is helping you have fun, maybe if didn't look quite so happy? The fuzzieness hurts this picture and the coloration doesn't really help either. A 3
The blurriness, noise, eerie eyes, and spooky smile create a sinister mood. Good idea, but perhaps a bit overdone; I think a little less would have been more effective.