Set up files, sketch and plan concept
The document is created portrait at 5,000px x 6,470px, at 300dpi. Sketches were created to establish the main elements, and a few thumbnail screenshots of mountain regions were used to paint in some values. When creating my own content, I find that allowing myself to drive the image, instead of following the photography that already exists, keeps things challenging enough to keep my interest. After getting thumbnails down, I tried a larger line sketch just to stay connected to my original vision. I then use this layer as a checker using an Invert adjustment layer. Alt-clicking between both layers clips this onto the line work. This will help to view this in black or white.