
The problem is the same image may not work well depending on the relative size requirements. For example, here's a landscape image.

And here's the same image, but cropped as a square.

On a side note, the New York Times also has pretty specific photo specifications, at least as compared to most papers. Here's an excerpt:
"Couples posing for pictures should arrange themselves with their eyebrows on exactly the same level and with their heads fairly close together. Couple pictures should be printed in a horizontal format.
"Our policy on photographs has changed. While we continue to include formal portraits of couples and individual brides, we also include full-length images of brides in wedding dresses, as well as informal photographs of individuals or couples at home, outdoors or in other attractive settings. Those posing for pictures should be neatly dressed, and the images should be of professional quality."
"Our policy on photographs has changed. While we continue to include formal portraits of couples and individual brides, we also include full-length images of brides in wedding dresses, as well as informal photographs of individuals or couples at home, outdoors or in other attractive settings. Those posing for pictures should be neatly dressed, and the images should be of professional quality."