Hierarchy

Hierarchy is more common in typography than in images. But images (especially posters) can have hierarchy too. Generally, when something is bigger or different than the rest of what's on the page, that gets paid more attention to. For instance:

This is a movie poster for "Moon". There are three aspects of this piece that your eye is drawn to. You're first drawn to the image because it's big and unique. I've never seen the movie but I can gather that it's about a guy who gets stuck on the moon somehow. The fact that I can get all that is because of how strong the image is. It should be what your eye is first drawn to. Then you're led to the title because MOON is in big letters in the biggest font size and it's the whitest text of the poster. Then it's either Sam Rockwell at the top or the tagline. Rockwell because it's all by itself and the tagline because it's right above MOON. Lastly, if you're still interested, you read whatever is at the bottom. 

I mostly googled visual hierarchy for these examples. These are just funny things I found in my search: