I'm not really liking the double exposure to be honest. It just looks like camera blur except the one where the power ranger is looking like he's stabbing through the other. The last one...is just a mess. Completely. I don't know how it could make any sense. It's over lapping too much and just doesn't really fit the picture.
You have to be really careful with what you double expose, it is something that I don't really like to do. Don't let your camera do stuff like that for you, you should really learn to do a composite shot in photoshop it could come out MUCH cleaner and wouldn't look like you don't know what you're doing.
I don't like the second photograph. Skin retouching would of really helped with that matt look on her. Giving her smooth skin would of been a better idea. But I like the first one very very vibrant!