Original Photograph
This is my son. He wanted to be a zombie so I popped him in front of the green screen and here we are.
A basic zombie with Photoshop
A basic zombie with Photoshop
After Painted & Blended in Photoshop
Fake Promotional Implementation
Lowered saturation and upped the clarity of the face and sharpened the details on the face to make it look more decayed.