I have my own set of brushes that I use from modified packs. It really depends on the environment that I'm doing on what brushes that I use. I mostly use a brush that I call a Sketcher. It's basically a square that has a bit of texture on it. I use the Tool presets for the brushes that I have. It saves me time customizing them. You can find them here: [link]
Perfect detail level for this kind of image, I really like the gray mixed into the white, adds a huge amount of tone and emphasis on the crazy mountain weather. The travellers are a great touch, it brings to light how hard a trip like that is, and what their going through, my only criticism is there are too many visible swirls that haven't been blended. They stand out in the center and upper left. Other wise, great image again.