Atmospheric Perspective Study

[Wardy]

you can get away with tiny levels of saturation and still achieve great depth, its all about values.
for example, check out these:
http://rxw-conceptart.deviantart.com/art...-444286249
http://rxw-conceptart.deviantart.com/art...-449155154

I especially love that last one because hes used a beautifully limited palette but it looks fantastic and really pulls focus to the one focal element in it. Spotlighting saturated parts works really well, for example: http://rxw-conceptart.deviantart.com/art...-447285898

I would do a bunch of studies from these kinds of paintings, or ones that inspire you which play with saturation (not photos i know, but i have learnt a lot learning how to copy a pallette or technique). Above all, keep a layer on color setting, and fill the whole thing black. That will make a switch on/off monochrome layer so you can see only values- this will help a lot in keeping that atmospheric perspective while being able to use less saturated colours in the fore/midground. Nice study btw, you're on the right track for sure.
Keep going! Hope that helped.