Interesting idea good luck!

really nice balance... but since it's an alien maybe saturate the color a tad so it stands out from the back ground... your edges need a little bit more tender care (perhaps blur them delicately so they aren't so sharp and obviously masked out) the face needs the same care as well.. Don't ruin the image but play with the saturation and contrast and you will be surprised how much you could make this image POP good luck though.. great IDEA

very different

idea is good. cutout and fixing need more finishing

shadow is not good

Good Luck.

very nice