Photoshop :: Possible To Superimpose Picture Of Female Model On Mannequin

I have a picture of a white female mannequin. I want to know if it is possible to superimpose the picture of a female model on the mannequin and make the mannequin realistic human looking? Following are the requirements.

1. Attach head of the female model to the mannequin body.
2. Change skin tone of the mannequin so it matches the skin tone of the model
3. The hands, legs, torso of the mannequin should look realistic. How can this be done? It's easy to just change the skin tone of the mannequin but making the mannequin look realistic is becoming a challenge.
4. check the attached document. The first image is the finished product where female model image is superimposed on a mannequin. Second image is a white mannequin that needs to look similar to the first image.I am not adding the female model image now. I will do that once i know if this is even possible.