What about color temperature? Do warm colors really come forward and cool ones go back in the illusory space?
Then there are the effects of atmospheric perspective, which compress the value range as we look farther into the distance.
How important is it to always "follow the rules"? How much does the illusion of space depend on making sure the viewer knows what your subject is?
Below is a gorgeous painting by Frank La Lumia that has a deep sense of space. He makes sure there is no confusion about where the shapes are relative to each other. What would happen if the foreground were cooler and the background warmer? How about softening the edges of that shed in the mid-ground and sharpening those of the background mountains? How much can we defy convention without destroying the illusion of space?
Would you be willing to give it a try?
Here's one by David Taylor
Switch the color temperatures, making the reflections warm, for example.
See what happens. Maybe put some strong darks in the distance? Maybe not.
This one was mostly done with a credit card, but held to convention regarding color and value.
Have at it!