Gamma correction: I'm setting up your Artistic Lens on the above scene, Bill. It's a valuable exercise even if Keven Rudd is going to contribute towards a new PC and Poser Pro.

About that original scene... the lights were:
Main Inf 95% intensity, 1,1,1, Ray trace shadows, blur radius 6.0, min bias .2, nil amb occl
Rim Inf 65% intensity, .9,.9,.9, nil shadows or amb occl
IBL 20% intensity, 1,1,1, no shadows or anything

IBL was xRot 9, yRot -15, zRot 0 (my ignorance about this light prevents me from seeing the significance of IBL light placement... might need to run some close-ups to see if there any changes, although I've kinda picked up now that just because I can't see it, doesn't mean it isn't happening).
Rim xRot -109, yRot 56, zRot -406
Main xRot -59, yRot 25, zRot 2
Shot with the main camera focal (and perspective) set at 120mm.

The subjects in this image are really YOUR sand procedural shader, Bill:

...on a plane I made in Blender. I mucked around with a few values - some would call it "adjusting" a few values, but that would imply I actually had a full grasp of what each node did and thus which values to change to arrive at my desired outcome. I did get what I thought I wanted: sand the colour and texture of what you'd see at Spenser Park to the south of Kawaihae harbour on the Big Island of Hawaii.
Did I leave anything out?

Probably did. Now I'm going to render through that "lens"... going to do this step-by-step. It's have to wait till tonight, since my patients won't be happy having to wait for me...

BTW, I'd like to clear something up here. Contrary to your thinking, I do embrace maths as they pertain to colours and managing them in Poser. Being ignorant of maths and hating maths are two different critters. I was told when I was little to stay away from any career involving maths as I didn't have the aptitude for it. Big mistake. Never tell a child that. I may not have it naturally as some do, but it doesn't mean that I don't see its validity in what we're doing here: I DO and so am keen to learn. It's just that since I haven't wrapped my head around trig and algebra since high school, the concepts sink in slowly.

Next instalment tonight.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks