In these shot - the prosthetic latex mask was glued to the actors face. The problem was the mouth and chin area kept wrinkling and making folds in the latex causing that area to look really bad on screen.
First, I took a still in focus frame into photoshop and made a neutral clean plate for the chin, lower lip, and sides of mouth. Next, I broke the patches up and used the combination of planar tracker, 2d tracker, and camera tracker to track in each patch to the face. Then I used a corner pin and grid warper to counter animate the talking and stretching skin areas to match the actors dialog. Finally, I added a color correct node to adjust for animating shadows and highlights on the skin to make this shot as seamless as possible.

In this sequence my task was to Paint out all the mortar sand dunes before they exploded in this "storming of the beach" sequence. I had to rebuild splashing water and horse legs. 

In this shot, I had to paint out the blood on Rick's face. As it was to dry from so many takes. Then I had to add blood to his face to match continuity between shots. I 3d camera tracked, as well as used the grid warper, corner pin, and spline warp to integrate a solid track and movement on his face.