Novcel has a bunch of images like post #2092350, post #3251224, post #2695390, and post #3249797 that appear to be anime/manga faces and details added on-top of real photographs. The artist does not say that this is how they create the images, and no "base image" is provided, however the style significantly deviates from much of their other art, and certain aspects of the images have clear differences in shading (separating the original photo from the added-on details).
I have added the photo-referenced tag to two of the images, but hesitate to go through them all without any evidence or agreement from the community. Do you agree that the images are literal photos with drawn details, and are okay to tag?
EDIT: After further discussion on Discord I agree that the photo-referenced tag should not be used without an actual reference photo. I will instead add the images to the expert shading pool. (uncanny valley also looks like a good choice :p)
Updated by FormerlyJ