>>3993259
>In BB's case, there are no glaring deformities in the character or the background
His right brow and where it goes in to his nose is messed up, the way his elbow interacts with the sheets looks off, and the orangeness on his ear looks like translucent skin luminescence from a non-existent light source.
But like you say, the biggest tell is just the overall look. You can tell both are ai just from the thumbnails.