It depends on what you want to do with postwork.  Some people paint over their renders to create clothes and hair which wouldn't otherwise be available for Poser.  Some use postwork to touch up where body parts have poked through clothes, or to fix a bad looking joint on the figure.  Others use it to colour shift, saturate or desaturate their image, to lighten or darken and so on.  Yet others use it to piece together multiple renders and/or drop in a background image.

If you are wanting to paint onto your renders to add clothes, hair, jewellery and so on, there are several tutorials on the subject.  Quite possibly some are here at Renderosity.  There are definitely several at DAZ, www.daz3d.com  and most likely at RuntimeDNA, www.runtimedna.com

I have absolutely no doubt Acadia, the Goddess of Poser Links, will have several good links for you to visit, too.

Just to get you started, you should always render as big as possible for postwork and then ensure you export your image in a lossless format such as PNG or TIF.  Always work on a separate layer when you start your postwork, unless you absolutely have to work on the image itself.  In which case, work on a copy of the image layer.  That way, you can always go back to the original if you do something wrong.

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