Your settings didn't look too bad, though any particular preference for the values in your specular and diffuse, or is that 'stock' for your skin maps?

One thought, though I doubt it's the perpetrator, is the gloss on the giant's fingernail. If it's at like 9800 or something way high (98% in daz is pretty typical), that could be acting like a mirror on the little lady's face, which can pop noise and fireflies like crazy.. Might be worth checking.

One other bread crumb, when you're setting skin settings, if you hold down control and click the main skin material areas (face, head, arms, legs, etc) you can set them all the same at the same time. Sometimes changing one too much from the rest will get you darker arms more than the torso, for example, and it can show very obviously when the samples get higher.

crimsonworx.com; free ebooks and previews

I've bowed down to facebook: https://www.facebook.com/crimsonworx