Re: Picture Session BEFORE the Nikah...Haraam?
I think you should have the photographer takes some pictures of just YOU alone before the nikkah....you will get the sunlight pics you desire this way and still be able to incorporate some luvely poses. I'm sure you want some pics to be just of you so this will be a good balance.
Then once nikkah is over, have a photosession with your hubby! This will probably not take as long since the photographer will not be too worried about capturing solo shots of you since it had already been done.
It may be the best compromise for everyone.