Author images? AI + post processing, Facebook, where to get em?

I need some images for authors to use on sites and socials. I dont want them to be detectable by AI image detectors, and i also want them to be unique(not taken from some random in a detectable way).

Any advice on how to achieve this?

Is there any post processing etc that could be done to AI generated images that makes them less detectable? All advice would be super welcome, cheers!