All of the vouchers entitle you to a free photo session and photo, you don't have to pick and choose. The ones I have say 'free sitting and portrait voucher' which means the photo session and 1 image is free. Usually the first lot of photos or pose they take are the ones you have to choose from to get the free photo.
They will then take more photos in different poses, individual shots etc. I think that the catch is that they will try to sell you other photos/collections which do cost a lot. I would recommend purchasing the CD with some or all of the images they have taken during the session because you can print, copy, email etc to family and friends as many as you want when you want.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.