In a black and white cartoon, a canyon might be depicted with bold lines to show its shape and depth. The shading could be simple but effective to give a sense of texture.
Drawing a concentration camp cartoon is a tricky and sensitive matter. It's important to approach it with extreme caution and respect for the historical facts and the suffering of those involved. Any attempt to draw such a scene should be done with the aim of educating and not trivializing the horror.
The 'Into Another World with My Smartphone' anime is largely based on the manga. It keeps most of the key plot points and character developments. Some additional scenes or tweaks are added to make it more engaging for the viewers, while still respecting the essence of the manga.
Shading in full body comics often enhances the depth and realism. It can define the form and texture of the characters, making them look more three-dimensional.