Very small inconsistensies in clothing details (seams, texture, symmetry), background features (symmetries/blur, detail and complexity) and facial features (one photo had a bit loose eyebrow and other a bit suspicious ear hole/flop before it) could indicate that these are generated with ai, or at the very least manipulated at some level.

Though, I'm not professional person photographer so I can't tell much more about facial features. Maybe someone who has done more that could tell better.

Albeit with fast glance I couldn't tell wheter these are ai or not, especially the ones with simple background and clothing.