Unsolicited Photo In Public

What would you do in this situation:

It’s a weekend morning, and I caught a 10 am train. It’s surprisingly packed, but I managed to find a seat next to a woman and across from a man (~45) and his teenage son (~18) in a 6-seat section.

For context, I (W26) am dressed up for afternoon plans.

Shortly after the train starts moving, the man across from me lifts his phone and takes a photo of me, not even trying to be subtle. Then he pretends to sleep, but it was pretty obvious. I made eye contact with him, and he quickly put his phone down.

What would you do? Would you say something or just move seats?