In the pre-diffusion era, GAN-generated faces were simple to detect. This Person Does Not Exist because of asymmetry, surrealism in the background, unexpressive ears, straight hair that looks like paint, the missing earring, etc. (the below image)
Today, when everyone uses Midjurney 4 or Stable Diffusion 2.0, I assure you it is more complex than the title portrait of Vincent. Therefore, using the below automatic recognition of AI-generated characters is worthwhile. Please test it out now: