A man and woman in formal attire are standing in a high grass meadow, posing for the photographer, and she has two of her fingers up on one hand behind his head.
A couple are having their wedding picture taken.
Not all photos in formal attire are a wedding picture, it could be a prom picture
Not all men and women are a couple.
Nothing in the first sentence implies the pictures is a wedding picture, it could be any kind of picture.