Appears to be IBL (Image Based Lighting), but DAZ|Studio can't do IBL, so it's a very good fake-radiosity job.  I'd suspect a large number of point lights combined with one or more directional (Infinite in Poser terms) lights, and probably quite a bit of skillful postwork, certainly a great deal of postwork on Killing Me Softly.

Getting that kind of look is easier in Poser IMO, because it can do IBL.  Be aware that a disadvantage of IBL is that by itself, it tends to produce very weak shadows.  You can also decently fake a look like that with just spotlights and one or more Infinite lights, and some attention to shadow settings for the various lights.  That look is easier to achieve when you're not concerned about shadows, as in the typical white-background pinup design.

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