Any picture you want! No size restraints. The program I use fits the photo to size. Sometime however, Depending on the photo. Some of the photo is cut off. For example. If you give me one with 2 people standing next to each other and you can see their full body. The legs will most likely not fit if you want to see their faces. So you would see like from the waist up. If you wanted to see the legs I might be able to resize it to show the legs and the upper body. But that would make the people very small. But it is your choice. I'm sure it won't be hard to work with. ;) 2 faces should be fine.