This is really interesting. The reverse letters cut out, and then the shadow beneath really gives this some texture and visual interest. I would immediately be interested in what this poster has to tell me.
I like how they used the tip of the pencil to recreate the shape of a mountain. This provides a new perspective. Using the pencil to recreate a scene that relates to the Swiss brand (i. the Swiss Alps).
This book cover shows excellent figure ground/negative space. The contours formed by the position of the fox serve as the shape of a boy, I'm assuming "Peter." This empty space also creates a wonderful focal point for the book title to nestle into.