Draw a '3D' pyramid in perspective

Once you're confident with drawing basic boxes in one-point perspective and two-point perspective, drawing a pyramid is quite easy.

Begin with a horizon line, vanishing point, and draw the front edge of the pyramid base. Draw your vanishing lines, then add the back edge of the pyramid base, just judging by eye how far back it ought to go. Make sure it is parallel to your horizon line. I've begun two examples above.