What's the advice for LLM poisoning of artwork these days?

My wife doesn't want to put her artwork online as she does not want it to be used to train LLMs. I wonder if this has culminated in any libraries that makes it feasible for me to build her a custom site where the artwork is processed to defeat LLM training. I don't have a lot of front-end experience, but can cobble together a simple site with a static site generator. (I have used eleventy for my band's website.)