Thanks for your reply! 
Indeed, the perspective will always change if we move the camera or our eyes since the vanishing points will also move from our sight which basically also change the object shape in our perception.
Actually something interesting which i realized during my exercise in drawing tons of boxes is vanishing point exist like in the direction of where the box come from, but that fixed point wont moving pretty much even if we change the view.
Something like if we assume that a box comes from fixed point in horizon line, if we change the view a bit lower near the box, obviously the horizon line will be placed lower while the box stay in its place and naturally it'll seems that the box distorted (like an above view) because we retain its vanishing point which is moving along the horizon line.
I think the same rule also follows if we move the camera higher and so on
Yeah maybe thats a basic understanding about perspective which i got from drawing boxes, yet i dont quite understand about how to bend perspective until it reach something like curve shape or something like that
Indeed, the perspective will always change if we move the camera or our eyes since the vanishing points will also move from our sight which basically also change the object shape in our perception.
Actually something interesting which i realized during my exercise in drawing tons of boxes is vanishing point exist like in the direction of where the box come from, but that fixed point wont moving pretty much even if we change the view.
Something like if we assume that a box comes from fixed point in horizon line, if we change the view a bit lower near the box, obviously the horizon line will be placed lower while the box stay in its place and naturally it'll seems that the box distorted (like an above view) because we retain its vanishing point which is moving along the horizon line.
I think the same rule also follows if we move the camera higher and so on
Yeah maybe thats a basic understanding about perspective which i got from drawing boxes, yet i dont quite understand about how to bend perspective until it reach something like curve shape or something like that