Usually it's skill gaps between the fundamentals. For example, having perfect proportions, clean line art and harmonious colors but very poor and amateur shading/rendering. Another one is vibes. If u feel the art has the same typical face/atmosphere Ai usually has, be suspicious
I have a question for fellow artists:
If an artist generates images with AI, then traces/heavily references those images in their art, how would you be able to tell/prove this?