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 :)
Mudbox 2015 Overview
An overview of the latest features Autodesk Mudbox has to offer. Mudbox is a digital sculpting and painting software that allows to add high levels of detail to 3D assets. Mudbox is a high-end tool that is accessible for newcomers and allows to create big projects.