Sometimes, importing it as a background image will throw the proportions of the pic out of whack at render time. It'll preveiw correctly and render wrong. So manually plugging it in is a better idea.

There's not really a "once size fits all" setting for Poser :) It all depends on what you're rendering and the mood ect you're aiming for :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.