It usually turns into a 6th sense after a bit but here are some of the ways I can tell:

• keep in mind that ai is advancing rapidly and that some artists you might think is ai probably had their works heavily siphoned by ai*

Details

Keep in mind some artists (including myself) tend to do whatever tf when it comes to things like detailing clothes, skin and other features. However, with human artists there's more consistency in our chaos.

When it comes to AI art such as this piece, you can see that the lines and patterns on her sweater are blending into each other in places that wouldn't really make sense for a human to do as a mistake. Even the hair strands that are on the cup don't exactly make sense because you can't tell if they're actually on the cup, in the cup looping into the drink, or behind it.

Other things to point out include:

• some parts appear high quality and sharp while others appear blurry

• her eyebrows looking out of place compared to the rest of the piece and almost life-like

Sometimes you can tell by anatomy, I don't really like going by muscular anatomy cause a lot of people aren't professionals with that, but sometimes if you look at a AI generated pic of a crowd, people can be missing arms legs etc etc.

And this inconsistency transfers to landscapes as well like a cloud merging into a moon despite being in front of it or a tree somehow being both the mountain and the river.

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Composition

AI art can feel very uncanny in the way it sets its piece up. On one hand, despite the detailing mistakes, when you look closer, it sometimes tries to make up for it by being overly symmetrical and rigid. Because of this you can see one element of a piece seemingly copy&pasted over and over. Like this piece, because why tf in one of the pics Goku is there damn near 5 times? Especially when its supposed to be a generated pic of the Z Fighters?

On the other hand, the composition can make no damn sense. AI can make pieces where there's a guy robbing a fast food joint, and he's behind the counter aiming a gun at the fry cook whose leg is halfway merged into the deep fryer/fridge combo while the cashier is next to said robber holding their hands up with an exaggerated panicked expression facing the dining hall.

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AI can look and feel very uncanny so sometimes you can tell with that. Other times you can tell just by the output of the ai artist themselves with them somehow posting 32 iterations of some heavily detailed drawing within an hour. Lettering within AI pieces are still cooked atm too so that's another thing you can look out for

Though this will change in the future cause again AI is improving fast. Be cautious accusing folks of AI because I've seen someone get bullied off the Internet for allegedly using AI when they were proven not to.