For rendering the fog effect, I used the VrayEnvironment Fog. I rendered it as a separate layer with a black-matte material in override and composited it later in post-production. You can view the settings below (Fig.30).
I used Photoshop for the post-production. These were the very basic steps such as Curves and Color Correction - nothing particularly special.
For the rain drops on the glass, I painted a texture of black and white raindrops in Photoshop. Then I mapped this onto glass in max and made a render mask of this texture on glass. With this mask, I applied a couple of filters on glass and made the effect (Fig.31 & Fig.32).
And here are the final scenes: Dusk (Fig.33), Summer (Fig.34), Autumn (Fig.35) Fog (Fig.36) and Rain (Fig.37).