Step-By-Step Instructions:
1. Open two photographs in Photoshop.
[Photograph 1] The photo of the person you will be adding a mouth to.
[Photograph 2] The photo that has the mouth you want to use.
2. Select the Polygonal Lasso tool.
3. Create a lasso selection around the mouth from [Photograph 2].
4. Click CTRL+C to copy the mouth.
5. Select [Photograph 1] and click CTRL+V to paste the mouth onto a new layer overlapping the original photo.
6. Click CTRL+T to enter Free Transform mode. Use the shape handles to resize the overlapping mouth to fit proportionately with the person's face on the layer below.
7. Click the layer underneath the mouth layer.
8. Goto Image > Adjustments > Brightness/Contrast. Adjust the Brightness and Contrast sliders so that the mouth matches better with the new face.
9. Goto Image > Adjustments > Hue/Saturation. Adjust the Hue and Saturation sliders so that the mouth matches better with the new face.
10. Select the Eraser tool. Erase any areas of skin from the overlapping mouth that got carried over from the old photo.
11. Congratulations, you should now have your new mouth!
