First Person POV:


Third-person POV (over the shoulder, usually trailing):


Third-person POV (sometimes trailing-view):


3/4 Isometric (or "God's eye") POV:

World Scale

The scale and balance of objects relative to one another gives a uniform size to the environment.

Placement of the camera and its focal length can have an impact on the perceived scale of the environment and the size of the observer.
However there may be times that you need to match the focal length to a display device such as a head mount display or CAVE walls. Large scale immersive display can be most effective if the camera's focal length approximates the same scale of depth perspective as the human eye, which is sometimes estimated as the equivalent of a 50mm lens on a 35mm format camera, but better described as:
Each eye:
Horizontal FOV = ~ 140 degrees
Vertical FOV = ~ 90 degrees
With two eyes, we have a horizontal FOV ranging from about 160-208 degrees (depending on convergence of the eyes and individual differences)

So a 90 degree FOV for a 4:3 aspect image is not a bad starting point.

The velocity at which the observer can move through the environment has an effect on perception of world scale as well.