It's the final process and the most important one to me. I use Photoshop as the main software, sometimes I use others like After Effects or Lightroom with Photo looks Plug in.
First of all start with adjusting the brightness and contrast of the image and also make a quick color correction.
After that make a copy of the main layer and select the corners adding Feather, then add a touch of blue to them.
Sometimes you need to add more selections with feather in certain areas to add that warmth feel to your image.
Also make an Ambient occlusion render of the scene and add it as Multiply, you might need to change the opacity of it, doing that will add more shadows and will bring out the details in your visual.