The photo booth can be used to take a picture for your Town ID Card, but you won’t be able to use it while your town’s gates are open. Photos cost 500 bells each. Use the L button to make your photo monochrome and use R to make it sepia.
When taking pictures you can also use emotions you’ve learned from Dr. Shrunk. When the timer counts down before taking a picture, tap the emotion icons on the touch screen. You can retake the picture as many times as you like so don’t worry if you mistimed the emotion.