I've been working on controlling saturation levels. 

It's a preference thing, but I tend to find overly saturated images a little cartoon-y. If you look at default production images from Unity and Unreal (game engines), you can see how most video games tend to lean quite hard in the saturation zone. Perhaps it's for clarity, as a player you want elements to be distinct so you can follow the game, hence cocaine colour injections in the game environment.

But for pure aesthetic appeal, somewhere in the middle of the value range and saturation zone is nice to let your eyes rest. A lot of painters don't use the full value range (from 0 - 10, very brightest to complete dark). And some photographers use this rule too, staying somewhere between 2 - 8 in the value spectrum. 

Well, these are today's renders.

I liked the black and white version too. 





Of course, really the goal of any artist is to make a brilliant image, regardless of image science. Look at this picture, so many questions to ask here, got your attention right?