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Directional light is what causes shadows. Imagine if you shone a spotlight on your model, you're going to see a shadow on the wall behind her. Now, if you soften that light, the shadow will get softer too.
To eliminate that shadow you are going to have to light the shadow, or hide the shadow.
You could light the model from directly in front of her at an angle that throws the shadow directly behind her. As long as your camera is looking directly at the model, the shadow will be gone. However, this isn't nearly as desireable as using lighting from an angle because this will also eliminate most shadows that define the contours of a person's body.
You could light her from the left of your camera, and use another light on the background to eliminate the shadow. However, you're going to have to be a little knowledgeable about lighting ratios here because then you can decide whether you want the background to be brighter or darker than your model.
Using extremely diffuse lighting (soft light) will make the shadow very soft, and not so distracting in your photo.
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monica AT monicaweb DOT net
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