Mirror image portrait

I will be demonstrating in this post how to create a mirrored portrait in photoshop:

Step One: First open image you wish to duplicate. You then need to extend the canvas to have enough room to duplicate. I am mirroring a portait image horizonally rather than vertically so I extended my canvas to the left by 50% 

Image > Canvas size > chanhe pixels to cm and double widthand adjust the direction canvas extender to direct which area you want to extend.

Step Two: First duplicate layer by command j and then Edit > Transform > Flip horizontally

Step Three: Select the eraser tool and a large soft brush and erase the extended canvas on the right to reveal the original extended image underneath.

 Step Four: To blend the backgrounds to create a more even flat colour you can add a fill layer with a darken colour blend mode. If you select the colour of the original background it will even out the colour.
Layer > New Fill Layer > Solid colour > Select background colour with pippet > OK > select fill layer > select Darken colour blend mode

Flatten image and voila!