Model: http://clintshields.deviantart.com/
Stock photo: http://mjranum-stock.deviantart.com/art/Warbird-C-4-120683003
More free stock photos: http://mjranum-stock.deviantart.com/
Credits to Marcus Ranum

Open a front face portrait and a Terminator photo. Select the Terminator photo, Ctrl+A to select all in this image, Ctrl+C to copy it, then Ctrl+V to paste it over the photo you want to edit. Rename this Layer to T_head. Convert this new layer to Smart Object and reduce it's opacity to see the background but also see the terminator head.


With the T_head layer selected press Ctrl+T to transform it (Edit->>Free Transform). Adjust it's size to cover the model's head. Also be sure the light falls from the same direction. Then accept your transformation.


Apply a mask to this layer. Choose a 0% hardness brush with the black color, select the mask and paint over half of the face to hide it, also hide any background.

Set the opacity of the layer to 100%.

Continue to paint with black to hide and with white to reveal until you are satisfied.

Readjust the size of the T_Head with the model's head, and the brush hardness to 90-100% to make the margins sharp.


Apply an inner shadow to make the skin look like it's above the Terminator Head.

Create a new layer and fill it with a medium pale cream and set the blending mode to overlay. Create another layer and fill it with a a medium pale blue and set the blending mode to Color 26% Opacity.