>>942782After some analysis of the image, because the walls recede to a vanishing point so close to the centre of view, this means the horizon is near infinitely off-screen to the top of the picture as the lines that are parallel to the ground plane do not recede to a vanishing point until a very very very very very massiiiiiiiiiiive distance off-screen.
It is a very strange perspective orientation to use because it is so high.
Basically to draw in this perspect, draw all lines parallel to the ground as parallel on the page because they do not really converge. Then draw all lines perpendicular to the ground (e.g. the planes of the wall) receding to a singular vanishing point close to the centre of view.
