Prepare your images for a 4:3 aspect ratio. Aspect ratios may vary from phone to phone, so keep this in mind as you're snapping away. You can always photograph a wider area than necessary and crop it later in iFixit's media manager.
Shoot your images in landscape orientation. It may be tempting, but don't rotate the camera to take portrait shots. For layout consistency, we require all photos to have a landscape 4:3 aspect ratio.