terminator over woman face

In photoshop with help of layers we can apply different effects.Like in the above image i have applied a terminator face over a woman face.In this first you have to take to images (i) the face over which you want to apply effect and (ii) the image to be applied over the face(like terminator). in first layer simply take face image and then in second layer take terminator face and add mask filled with black color (put black color in foreground color and press alt+backspace) then take a feather brush and drag over the image to see effect