Things You'll Need
Instructions
Observe your subject from a distance. Look for any expressions or movements that the subject repeats that could make for an interesting picture.
Prepare your camera. Set the exposure and pre-focus on your subject, if possible. If your subject is moving all the time or your distance from them is changing, then you may not be able to do this. Keep your camera powered up by pressing the shutter release half way down. Today's cameras will shut down to save battery power if they have not been used for a few minutes.
Attach a medium telephoto lens to your camera or extend the zoom lens on your camera to around the 200mm mark. This focal length will allow you to be at a good distance from your subject and still be able to use the camera without a tripod or monopod.
Keep the camera close to you eye, or up to your eye, ready to take the picture. Press the shutter release as soon as you see your subject change facial expressions or start to do the activity that caught your eye initially.