You will need;
1. Simply scan the images into my computer. Then print out a copy of the image at the scale you wish to use.
2. Stick the image/images to the wall using the washi tape. If doing a group of images it looks good to use different tapping methods.
The images can look great grouped together or laid out in a more formal grid like fashion. Best way to figure out how they look good is to lay it out on the ground before hand and play until you get a shape you like..