Spotting errors like fingers is getting harder, however, what I usually notice now (and look for) is a 'glossiness' that they have. The AI images tend to have this sheen. Including on surfaces that would otherwise be matte, or even shinier surfaces that would normally be a bit less shiny. It's as though a filter has been applied over it to make it more slick (like both oil slick slick and 'professional' slick slick).