Hi there !
Indeed, some are hand-drawn, but just a few for now, most of them are still AI generated. I mean hand-drawn as in made by an actual human being (even if it's digital painting, so maybe in that case "hand-drawn" is not the best term ? --my apologies if that's the case, English not being my native language is still visible sometimes ...)
One of my next biggest objective is to replace all of it with only human-made illustrations by some artists I know, but money is tight for now, so in the meantime, I've decided to release what I have for free.
It will remain free as long as there is any AI generated illustrations remaining.