Generally speaking when the viewpoint of a drawing is at about eye level for the reader, vertical lines will run parrallel to each other. If the viewer is lying on the ground, vertical lines will converge in the air.

In the case of this drawing, we are conveniently supplied with a light post in the center of the panel with which we can dudge which line are correct and which are out of allignment.

And now that I look at it -what the heck is going on with the floor tiles in the bottom left panel?