Awesome! I had been working on a similar project couldn't figure out the snow on the trees for the life of me! It's great to see how you approached it. The work look great! Thanks for sharing your process.
I believe author would be surprised that it's not american, but soviet bunker :)
CG Student Award recently published a fantastic tutorial by Christen Smith, a 3D Generalist/Modeler, who specializes in creating detailed environments.
Christen managed to make a very close copy of the cabin environment from the Dead Space games.
In this fantastic article Christen went over the whole development process: gathering of references, blocking composition, finding the golden ratio, building assets and compiling it all into one amazing scene.
He gives direct details as to the lighting and camera setup and render setting. A wonderful tutorial to help those, who are just starting their work with visual tools.
Be sure to check Christen’s Artstation page. There’s a lot of cool art there.