There are lotsa tutorials for mastering the basic portrait lighting patterns. Rembrandt lighting, loop lighting, butterfly, split and direct lighting - all are important. The tutorials show the effect on your models face. This is good, but you are not in the head shots-only business, are you? But none of the tutorials is showing you the effect of the patterns on your models body. Except this video:
This video is from Good Light! Issue 21, the one with plenty of tips for perfect portraiture.
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I wish you good light!