Quickly assessing your first material room screencap, I wouldn't use a second PrincipledBsdf for displacement. In Poser 11, displacement does not work quite well unless you subdivide the prop and use a math node to give you the right settings. Don't use emission as a translucent cheat in Superfly; it won't look correct. Subsurface scatter could give you a jelly-look but you will need to play with setting values to get it right.