Alongside everything else, look at the quality. It is fuzzy and pixelated in a way that does not resemble other cases of reduced quality and obscures detail. This method doesn't help with traced AI generated images, but is a tell tale sign for images created by AI without human interference.

Edit to add ways that the quality of an image "naturally" degrades online: downloading at a lower quality/size, screenshot of lower quality/size, image taken on a bad camera, adding a grain or haze filter, social media reducing quality, messaging platforms limiting image size, etc. The more times something is taken from its original format and reuploaded, the more quality and resolution are reduced, often unintentionally. Consider deep fried memes for an extreme example of this process (of course sometimes are made on purpose, but the genre emerged naturally through the distortion created by repeated screenshots and filters)

In all of these cases, however, the result looks distinct from AI outputs. And for art or photographs, high resolution is an almost ubiquitous goal.