Just some observations. Remember we all don't operate at the same speed.

It matters if you use LuxPose or not (DUH!).

In the image you see, the Poser Render (your left) uses the face camera and it is set at 95mm. LuxPose reads at 75mm.

You can see the difference in the faces. We set the 5 numbers to reference points on the Poser Rendered image. [1] The tip of the tiara. It's lower in the LuxRender. [2] the corner of the right eye is lower in the LuxRender. [3] the left corner of the mouth is about the same,  [4] the bottom of the chin is higher in the LuxRender.
[5] Just shows, that for the IDL calculations, Poser was told to ignore the hair and LuxRender said "Hey!, No problem and we'll do the transmap for you too!"

Also note the difference in how the eyes are rendered.

I have yet to play with code that adds lights and sun lights etc.

"Few are agreeable in conversation, because each thinks more of what he intends to say than that of what others are saying, and listens no more when he himself has a chance to speak." - Francois de la Rochefoucauld

Intel Core i7 920, 24GB RAM, GeForce GTX 1050 4GB video, 6TB HDD space
Poser 12: Inches (Poser(PC) user since 1 and the floppies/manual to prove it!)