First, What I like to do is to split the poster into thirds with imaginary lines. Then, I move the pictures or photos in the top left third of the poster. After I add the pictures and photos, I move anything extra that I don't have, or "extra space", under the pictures and photos.
Second I make the Information taking up the Top right corner to the pictures and photos area. I have the information go down until it's at about the halfway mark in the Extra space. After I make the Information, I add the bibliography, underneath the information area. When I'm done adding all of those boxes with everything in them, I'm done. You can add a border or anything else onto your poster. You can rearange the four main areas if you would like, or you can keep them the same. After you get your poster done, Comment on how you think I did on my first instructable.