Ask spergy questions, get spergy answers. Fucking doom tags
I wasn't answering the question, I was asking what you are trying to achieve. Correct means a lot of different things to a lot of different people.
Correct might mean making sure your straight lines are straight and your curved lines are curved, or it might mean your car is already correct, and it's supposed to be distorted and unclear. It might mean clarity in shapes, communication or intent in the abstract, or making sure your forms follow some system of perspective, linear or otherwise.
It might also mean that you draw the thing you want to depict in the exact way you want to depict it, as seen from the exact distance and vantage point you want it seen from, lit in the exact way it needs to be lit, as if the viewer was focused on the exact point the viewer should be focused on, distorted in a way that it matches the specific eye size and any retinal imperfections that your viewer would experience if they were seeing all the details of your image at their intended distances.
You got a different eye? Standing an inch too far to the left? You look at the wrong part of the picture? Fuck you, ain't correct.
By bringing in heavy math and nuanced projections, you're setting the bar higher than most artists, past or present, have ever achieved, and before you can even draw a passable line. You're setting yourself up for failure.
There is something that could make your art look "normal" besides superb precision in tiny details. It's called marginally competent precision in the biggest details. Or frankly any precision anywhere.
You're worried about hitting a little too close to the edge of the bullseye instead of the very middle while you're shooting into the crowd behind you. The best ammo, tools and knowledge in the world can't help you hit your target better if you can't even tell that you're shooting into the crowd behind you