Photoshop Retouched Shrek 2 Publicity Still: Handsome Shrek and Fiona

In this shot, beads of Fiona's dress showed through the inside next to her right shoulder, Shrek's right shoulder also had light leaks. - HG

Hank's Photoshop Retouching Tips and Tricks

Do not paint on the original layer. Save it as your base layer.
Create new layers for retouching efforts, create a group for many layers if necessary.
Name your layers or groups to stay organized.
Use the cloning tool brush, to grab the grain and nuance from the original image.
Take advantage of the "Lighten" and "Darken" brush settings.
Use large, soft brushes when erasing, lightening, shading.
Be prepared to use Undo or History for multiple undoing.
Of course... use a pressure sensitive painting tablet , such as the Wacom.