This little event gives you a montage menu for, say, unlockable content art (I'll make something for that later; maybe some condition branch/item deal).
What's nice about it is that it centers the image, and you can move back and forward between them. You'll notice, however, that the coding looks wrong, but there's a number of very large errors about images in the editor; luckily I made a tutorial about that. You may have to fine tune the X position; 150 worked for my busts, but I'm not sure if it works for everything.