Art Fundamentals for GAVFX page button below.
Photoshop
Here I used Photoshop to mask Pedro Pascals face onto Jack Sparrow. I used black masks to reveal the image and white mask to remove image.
I did the same as Pedro and Jack for Connor except using zombies. This was much harder as I had to mask dead flesh with real flesh and the mouth didn't align properly with his face.
I used the same white and black masks to turn a sunny bright field into a night time scene with a car and a cracked road.
Kratos but blue
We used photoshop to essentially mask colour onto a character or photo of our choice, I chose Kratos and then painted solid colour onto the different sections, so for example the skin, and then selecting soft light instead of actual colour allowed the details from the background to be seen whilst still painting the image a different colour.
This is some concept art from the Eclipse project, zombies breaking through the floor of a log cabin.
I did not draw this I just used photoshop to colour it and make it break through the wooden floor.