A word about the Design
I am using the A1 format for my poster. It is around 7016×9933 pixels, which is too large to use photographs within the canvas. All my images look too small, making my task harder because I have no choice of extension to compose something.
I did it for a previous poster without being sure I would continue using 150ppi instead of 300ppi in my files: fewer pixels, less quality, and more creation options. I also want to say that I will take the time to improve the quality of my posters.