Did someone say landscapes?
For shooting, I tend to stick between f/5.6 and f/11 depending on light and need. Sharpness has a tendency to fall off beyond f/11 because of diffraction, and very rarely is the increased depth of field needed in landscape work. Lens choices can be all over, and I love getting slices of the world with my 135mm with lots of detail over broad and sweeping world views with wider lenses. Doesn't mean I don't find myself sticking the 17-40mm on often. Polarizing filters can be nice on cloudy days as well, helping to bring detail to the sky and deepen the blues.
Honestly, post processing is a huge part of landscape work, and a large part of what makes Ansel Adams work stand out so much. The zone system is immensely helpful in approaching exposures, setting up post processing to be ideal. In general, don't be afraid to massage colors a bit to get desired results, warming or cooling as needed. Gray skies can create far flatter captures than what our eyes perceive - adjusting the exposure to match your perception is part of the process. Dodging and burning also plays heavily into the workflow, as accentuating lines and details to drag the eye around is key to involving the audience. Composition is big too, but you have a good eye for that already,
I quite like that lost shot. Not sure what you've done editing wise, but I personally would fiddle around with bringing out details in the bottom of the frame, maybe adjusting the curves a bit/exposure as it is a touch dark, and then fiddling around in the sky a little. The cold vibe is quite fitting, but I feel a bit more detail could be here and there.