Re:顶,待批
I would use flash light to wipe out the shadows on the face here.  The primary function of light is to narrow down the dynamic range to the scope that a camera can take properly -- in your case -- to take away the shadows on the face. Another function of lighting is to improve the composition or to be part of the arrangement, therefore it could create shadows for a good purpose. I hope this helps. 
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肖像是个人情感的风光; 风光是天地灵动的肖像...RayWei@2007
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