How to determine camera position

Where was the camera positioned in this shot?

If you know how to tell then you can begin figure out how some of your favorite photos were made. Let's begin to break it down. You can tell that the shooting angle was low mainly because of how much of the underside of his chin and nose you can see.

Assuming he and I were the same height, I wouldn't see much if any of the underside of either. Another clue is that the camera appears to be pointed slightly upward.

Sometimes it's obvious and other time not as much.

One tell is when a camera is pointed up from level, vertical lines (buildings are a good indicator) tilt outward at the top toward the frame edges. This is called keystoning. If pointed down the the lines point in at the top and expand at the bottom. This of course is easier to see when the horizon is straight but you can see it if you try.⠀⠀⠀⠀⠀⠀⠀⠀⠀
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If your favorite photographer consistently shoots from a low angle on the street there is a good chance they are shooting without looking through the viewfinder (sometimes referred to as Shooting From the Hip). If you are trying to emulate them and can't figure out whats wrong then eliminating one of the variables (a big one) will help.

Let me know if you have any questions on this. It seems straight forward to me but then again I know what I was trying to say.