I was told that "Anima produces better results than Illustrious". I gave it a try.

While the lines are indeed noticeably nicer with Anima models, the fact that I am inevitably losing what little collection of models I've managed to scrape together at this point. And apparently Anima by itself doesn't do whip marks at all. It is also quite incapable of producing decent facial expressions - and the pool of available Anima models on CivitAI is surprisingly scarce.

So after running some of the tests on the models I DID manage to get, I decided to stick to Illustrious. At least until I get my hands on some proper concept models.