>>2123863Check it yourself. Example utilizes your first try.
The shorter orange vertical is 5.5' high, the taller one is 8' high.
The girl and the bars were lowered until the longer bar just touched the horizon.
Now she's correct.
The black lines converging to the VP (vanishing point) show how large she should be at any distance.
Once that's set, she can be slid sideways to the desired position.
This is single-point perspective.