Believable#D - It looks like one of the big differences between the two images is the shaders (and the lighting is different too). The Poser image looks like it is usiing a very mild SSS, and the Reality/Lux image looks like it's using a mat material for the skin rather than a skin material? Maybe there is some unusual color being assigned to the Surface Color and Interior Color for SSS in Reality.

I've always gotten much better "out of the box" shaders and renders with Reality than this. Maybe it's because I use the simple version of mats/shaders (if possible) when using Reality/Lux. Reality 3 does a fantastic job of taking P4 style shaders(no SSS, no complex node tricks), and converting them to skin shaders that often need very little tweaking to look really good.

Since your new to Lux I thought this might help too (if you don't already know it). To gain more control over the lighting in Lux, for the tone mapping kernel it's typically prefered to use Linear rather than the default Auto Linear. This gives you the ability to adjust the Film ISO, Shutter, F-stop, and Gamma interactively during your render, just like you would adjust a real camera for optimizing the film exposure under the given lighting conditions.

Hope this all make sense and helps a little.

__________________________________________________________

My Rendo Gallery ........ My DAZ3D Gallery ........... My DA Gallery ......