I looked up "crackle" and used that image, while using the multiply tool on low opacity. I used the blur tool too grey out my eyes and looked up "gaping wound" and put that on my face to further zombify myself.
I used the airbrush eraser to create the fading effect around each of he image to better blend all of it. The background is a flood of koi fish, as well as mushrooms and an eye pattern created by me. The skeleton in front is sitting on a mushroom.