You don't.
AI art is pretty much an math question instead of an art question, we're using extremely powerful computers to first train a (math) model and then run slightly less powerful computers to actually run the models. You also don't do "x³+y³+z³=42" (Diophantine) from your head, you require a a supercomputer (and 65 years for people to make that supercomputer and figure out the math to do it on such a machine).
Why do keep people insisting that they can see what's AI art and what's not? Because it's "baby's first MS Paint job" at the moment, but they grow up so quickly!

And then they only see what's flawed AI art and not what's not, or they resort to guessing. Going back to MS Paint, most of us produce
horrible MS Paint jobs, but there are people who produce truly stunning artwork in MS Paint. If you didn't know, you wouldn't think it was made in MS Paint.
If people have no context in 'Art', would you rate "Birds and Sun (1954) - Karel Appel" as art by a famous artist or a finger painting by a slightly troubled 5 year old?
https://www.tate.org.uk/art/artworks/appel-people-birds-and-sun-t04163
Throwing all 'AI Art' on one big pile is also not a good idea, just like throwing all 'Art' on a big pile is a bad idea. You have different artists with each their own styles, strengths, weaknesses, expertise, and popularity. 'AI Art' is the same, each solution has it's own styles, strengths, weaknesses, expertise, and popularity. Expecting to recognize them all without context is insane! Especially when development is so extremely rapid. You need tools to recognize patterns we can't see/recognize, you might even need many tools. And those tools might not always be as perfect either. See this as an arms race with 'AI Art generation' on one side and 'AI Art detection' on the other. A bit similar to IT security vs hacking, you implement a security feature and the question is not if someone will find a way around it, but when.
A better question would be, why would you care? All the clothing you buy is not handmade and hand weaved, the industrial revolution pretty much killed that industry (almost 300 years ago). Do you want to go back to getting your books hand made by monks that copy them one by one and illustrate them by hand? Might kill ENworld Publishing in production costs...

Most artists, especially in the RPG industry already use digital/automated tools (often with some sort of AI process).
Let me give a personal example from here, ~20 years ago there was someone on here that made a map, I paid for what he made (after the fact). How did he make it? He made it from clay, photographed it and then did digital shenanigans to it. Vs. all the different mapping tools that are now commonly used and might even been used in your products. At what point do you say, I'm paying a fair hourly wage to someone to handcraft a map from clay, photograph it professionally and then make that into a presentable digital map? Or you pay someone who is making some very good and functional maps in an art-style you love in Wonderdraft? Would you pay both the same amount of money for a map? Would that be fair? And what of your customers, would they be willing to actually pay for that (vs. what they say)?
We, as humans have limitations on what we can do ourselves. Be that math, art, etc. But also in how flexible our thinking is (in accepting new thing or new realities) and that is very well
illustrated by the current AI 'issue'.
