Shadow darkness variations? In my scene, I have one object that's casting a very pleasantly dark shadow (not too dark, not too bright), and on another object, the shadows seem to be much lighter... Is there anything I'm missing or am I just being dumb... (And the material is nearly the same shade) The picture below (CYCLES) depicts a dark shadow on the big object, and light shadow on the small object.

And in the image below here (Rendered in EEVEE) The shadow darkness seems to switch.

Why do I get this feeling that the shadows are not cooperating equally in comparison to size and object.
I think that this is probably just because of the differences between Cycles and Eevee.  Eevee only "guestimates" the lighting, while Cycles calculates each beam of light and it's bounces. This is one of the reasons it is good to plan for which render engine you are planning on using before you start the lighting process.

BTW, I like your images. :)