Window lighting is soft light caused by natural light being diffused through a window. This is also a cheap and effective method of getting expensive; studio grade images.
Natural/window lighting also allows the photographer to move more easily from location to location without the hassle of moving movie equipment; such as lights and reflectors.
During the photo-shoot, reflectors were also used to reflect the light towards the model. Reflectors are useful as in flat lighting, a reflector can add interest or drama to the shot. https://www.shawacademy.com/blog/a-beginners-guide-to-lighting-a-photo-with-a-reflector/
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