These are not AI-generated. They were created by 11 different artists, other than the Dall-E one, of course. This collection is reposted from Eli the Bearded's site lady.lake.vision.
Most don't even look AI-generated, especially not like what AI could do in 2021 when most of them were posted. (Well, I'll give you the one by Riderbooker with suspicious lack of fingers and details in the face.)
Is there an NSFW-friendly federated alternative to r/ImaginaryCharacters or other members of Reddit's Imaginary Network? I skimmed over all communities of this instance but c/FantasyNSFW does not allow art for some reason. Perhaps there is some such place on PixelFed but I haven't figured that out yet, also it might not have subreddit-like communities...