Inspired by the works of Andy Warhol, and his examination of repetition, and use of other artists' designs/pictures/images with reprinting and republishing them in different mediums.
I have done something similar here.
For the three pieces that are the angry face, they use a face/emotion overlay that I have edited. It was then, after editing, put onto one of my works, that needed significant further editing to actually make the emotion work. This piece was then edited further, by colour and angle to form the repetition of three.
The fourth one is a fact/emotion that I drew myself. Eyeballed from someone's avatar. Not traced, but eyeballed. While I was heavily inebriated.
This face was then put onto the same base image I had created. It was edited to take the fact appropriately. And then the colouring was changed, inverted. To form the fourth face.