People generally seem to prefer segregating AI images from human created works in my experience.
For SFW AI creations !share_anime_art@lemmy.dbzer0.com or !imageai@sh.itjust.works may be receptive depending on the particular post. (The latter seems to like using AI for memes; Sailor Moon memes were popular there a while back, for example.)
For NSFW, maybe try !ai_waifus@lemmynsfw.com or !aigen@lemmynsfw.com