Use red-cyan glasses.
Keep your device always horizontal.
To take the second picture the camera should move to the right about 70 mm (1).
This displacement must be done parallel to the ground and without changing the camera tilt.
There are three types of help for the first photo and the displacement for the second one:
1: The horizontal line must be green (roll).
2: The vertical line must be green (pitch).
3: On the screen overlays the first picture to serve as a reference.
(1) When using the front camera, the displacement should be to the left.