I just released on my ArtStation store a new big pack of 230 photo references of sceneries from the National Park of Vanoise (France). You can find a lot of large landscapes of mountainsides and summits in the mist. Perfect for references, photobash and your own concept art :
https://tohad.artstation.com/store/b1bw/alpine-mountains-in-the-fog-photo-reference-pack-230-jpg-1-bonus-psd
Here an exemple of a scene I create in 40 minutes with it, the layered PSD is included in the pack.