Jeff and Julia Woods positioned their bride far enough from a large window to create a full-length portrait. The farther you move your subject from the window, the more light falls off and the more contrast there is. Here, the lighting was still soft and forgiving enough to require no fill.
Window light can fall off rapidly in intensity. One way to correct for this is to group the faces closely so that there is little difference in exposure between the face closest to the window and the one farthest away. Within moderate limits, one can correct for such falloff with minor dodging and burning-in in Photoshop
*Excerpted from the book "Master Lighting Guide for Wedding Photographers" by Bill Hurter