Nose glow: I am a convert to bagginsbill's emphasis on zooming your shadow cams to match your rendering camera (tutorial is found at first link in Acadia's post above).

While it may be faster to just fix just the nose glow in post, the subtle, better-looking shadows you get throughout the whole render -- which are harder to fake -- make it worthwhile to learn it, live it, love it.

It can be a pain in the butt to zoom and position the cam(s); I use only one shadow, and I usually adjust it only for a final render.

  

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