Have you looked into any of the free .blend files out there that have skin examples?  I ask because the standard in skin in Poser misses several nuances that most skin by Blender users seem to use.  IIRC, there's 3 parts to the standard Blender skin shading solutions I've found, which don't include bump, displacement, etc.    I have a .blend files for skin in both Luxrender (found in the Lux forums, I think) and the current Blender native (not Cycles, found in the BlenderArtists forum) that gives pretty photoreal results.

Not that it's not great to do your own experiments.  That's always enjoyable and fun. And your work looks awesome so far.

On scale: Going by Blender's  internal scale that seems to make 1 unit = 1 meter and Poser's scale according to Poser (how it interprets inches and feet), I scale up by 2.5 to go into Blender nowadays.  That said, lots of Blender people make up their own scale, so I'm not sure it's tied very tightly to Blender's settings.