I still think your main problem is light.

Delete them ALL.

Load bb's free sphere (free in in his signature),  put a image on the sphere. => See bb's instructions and discussions here in the forum.

Use only ONE true white infinite light in it at 55%  intensity  .

Render some control scenes with.
In the render settings goto Manual settings:

Cast shadows ON
SSS OFF
Raytracing ON
Raytrace bounces 1
Irridance catching 0
Indirect Light ON
Indirect Light Quality 7
Pixel Samples 3
Min shading rate 0.5
Max bucket size 32
Min displacement bounds 0.000
Second colon:
Smooth Polygons ON
Use Displacement maps ON
Poset filter size 3
Post filter type Sync
Gamma Correction  ON at 2.2

DO NOT DO's
Never-ever use AO, not on any material, not on any lights.
If you can, avoid IBL as if it was malaria. (yes BB, I know, but it creates 90% of the problems if used incorectly)
Never use older light sets that are not created for the Poser version you are using.
Never use older shaders that include "before IDL faking content".

DO's
Always render with Indirect Light => that is the best reproduction of real every day light
Always render in bb's sphere with an image on it => To create the IDL
Always render with GC at 2.2 => Only to be changed for artistic purposes.

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These are NOT the best settings.
These are NOT the law.
These are NOT mandatory

But these are to get you on the right track in a "neutral" and reather fast rendering evironment.

Happy posering
Tony

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!