Cheek blending

[Lofty1967]

Hi Guys,
Can someone give me some advice on how you would copy and paste part of a left cheek on a face to the right side of the face making it look seamless.
Many thanks
Lofty

[Hoogle]

select the cheek by using square marquee tool if go to edit > copy then go to edit > paste this will create a new layer with the cheek on select that layer press control +T to transform it right click in the transform box and select flip image horizontally. then apply a layer mask to the layer using a soft brush with a 20% opacity paint in black around the edges until it looks smooth