Some of the most beautiful photographs use only one window light. Seems simple and in many ways it is. However you do need to train your eye to see correctly and understand the light source. Here are some samples.
This works so well when photographing women. You can almost feel the softness of their skin. There is an interplay between light, the angle of light, the type of light being used, and size of light. all combined with the pose, angle of pose and all things “posed”….
To begin place your subject close to the window and see how the light hits her skin. Make sure there are no sharp shadows. You want to place your subject in a window where there is no direct sunlight only diffused. Try it out. You’ll love the results.