In my experience the biggest risk you have with people around aeroplanes is when they are wearing a hat or carrying something light and it gets blown off their head / they drop it then they instinctively start to run after it.
Get photos when you wish but make sure you control them. Don't let them just wander around to take one. People getting their photo taken tend to be looking at the camera while moving into a better posing spot without looking where they are going, the photographer is often looking through the lens and not focussed on what's going on around them. Someone needs to be overseeing the whole thing with an eye to the big picture.
Make sure passengers with cameras in the aircraft use wrist straps.