Paul - Relax, you're too eager to decorate your drawing with all kinds of converging lines. Let's go one step at a time. This session:
A; - this should be obvious - "
further away looks smaller". But the lines on your drawing that could have the function of VL's (emphasized in red) work exactly the other way round, the back edges will be
larger than the front

.
B. VL's are
only there to show you
how much smaller. The lines that I emphasized in green - and many others - are showing exactly
nothing of that kind

.

You copied the textbook examples faithfully, but after all, they are not intended to be copied merely, they should teach you how to construct VL's correctly. A line starting on a corner and going somewhere can as well go somewhere else

. A VL connects at least two points with the VP, or continues in the same direction as the edge towards the VP.
Good luck with your further study

.