I found it such a succinct but deep understanding of how to render final images, without mentioning actual methods. To roughly paraphrase, he says to use luminance, contrast and saturation to emphasize and de-emphasize parts in the image. The rest of the video is also interesting, there's a discussion on the environmental impact of travel and travel photography and how Joe Cornish sees local photography be a challenge to yourself and less impactful.
Landscape Photography with Joe Cornish - YouTube