As I’m not super comfortable with commenting publicly on social media posts, I copied the images into this blog post with a few comments
Pinterest board : https://www.pinterest.nz/vogt1401/principles-of-compostion/
Rule of thirds:
Golden Ratio
Negative Space
M. C. Escher, Sky and Water I , woodcut print, 1938. https://www.bloggen.be/artiest_escher/archief.php?ID=81582 
Gordon Walters, Kahukura, 1968, acrylic and pva on canvas, https://www.nzmuseums.co.nz/collections/3332/objects/1726/kahukura
Gestalt
While trying to find examples for Gestalt, I found that artists often use negative space as an element to execute this idea of Gestalt like Greg Pace with his ceramic sculptures.
Visual Hierarchy
This poster uses contrast, colour and size to create a visual hierarchy. ( also it uses Gestalt by arranging lines in a way that they can be read as a face)
Gridbased layout
Consistency
Klimt’s paintings have a strong consistency by repeating colours and shapes.
Alignment
The elements of this poster are diagonally aligned: The text in one direction and the dates and lines in the other. This makes the design dynamic and coherent.
Principles of composition in my alternative movie poster:
I used the idea of Gestalt by arranging simple shapes and lines so the viewer could read a train out of the composition. Looking at the rule of thirds, the windows as the main feature are placed in the upper third, the actors’ names in the lower third. This placement and the framing of the title and the small font of the actors’ names create a visual hierarchy that makes the viewer read the poster from top to bottom. Although I used two different fonts (a decorative one for the title and a simpler one for the names), there is a consistency in using only one shade of yellow for almost the entire design. I left lots of negative space, some of which is part of the train.