This may seem a bit obvious, but having taught many people flash/portraits, it’s the number one reason why you get bored looks on your photos….
Don’t look at the back of your camera all the time
You need get the lights right and checking this on camera is fine.
But once you’ve got the lights right, try to take, say, 20 shots before you look at the camera again.
The reason for this is “rapport”. It’s a term used in NLP which basically means you are both “in the zone”, communicating on higher level.
This happens in Photography when you start to shoot – talking, saying “wow that looks amazing”, moving around, looking through the lens… building their confidence, making them laugh, get them saying “prunes…. whatever you do….
You look at the back of the camera, and the rapport balloon bursts…
Only do it when a natural end comes to that phase of the shoot. You hit rate will sky-rocket