Basic Panel: Convert to Black & White, Contrast +25, Clarity +15.
B&W Panel: This is the core of the edit.
Blue: -90 (to make the sky almost black).
Aqua: -70 (also for the sky).
White: +30 (to make clouds and snow pop).
Green/Yellow: -20 (to add detail to the foreground trees).
Masking: Add Linear Gradient to the sky. Inside mask, Dehaze +10.