Search magazines to find similar size features, (old, young, male, female) and glue them in the proper place. Your challenge is to add what is missing and pull the variety of magazine cutouts together with colored pencils to create a face.
I don't know that I'd choose to do this on a wall, but cool idea just the same. DIY project using a variety of colorful magazine pages cut into strips. Pick a silhouette/trace an outline. Then cut up the magazine strips and tape/glue it all together.