I would say these are pretty natural. Fog, mist, and clouds are generally white, like shown in the pictures.
I really only shoot if it is foggy outside and timing between 30 minutes before sunrise till sunrise, and golden hour, which leads to the style of most of my photos. Typically try and avoid golden hour too. Sunny days are for editing, foggy days are for shooting. Some minor details might be lost, but overall, it works very well.
Shot in RAW. All depends on what you're looking for too. A lot of people like the under exposed, light and airy pictures while other people like, IMO, ridiculous looking HDR edits and unnatural colors.