I think the reason we draw our ortho sticking right out of the picture plane is so that we have a nice reference point that we can line up our heights from (the part of the object that touches the PP - don't giggle!). Also, I feel the reason why the image may appear to warp a bit is because the viewer needs to have quite a wide view to fit the entire object within their vision. Take a look at the lines that you draw through the picture plane, and the point where you're having them converge (the location of the viewer) if you look at the angle between the furthest line from this point to the left of the object, and the furthest line from this point to the right of the object, you'll have the angle of your viewers field of view. I recall Marshal saying that if this view approaches or goes past 60 degrees some fun distortion and warping will occur! so you could get less warping by moving this viewers position further back (down on the page) and this will change the marks on the PP such that when you plot them again you'll have less distortion. and finally, if you wanted your drawing to look more like the ref image you attached, I think your spot on with your assumption that its to do with eye level (or horizon line)! in the reference image the top front part of your vehicle seems to be just below the horizon line, whereas in your projection you've plotted the top front of your vehicle to be just above the horizon line. perhaps if you put the vehicle in a box (both in the reference and the plan-projection) it would help to vizualise how you want to position your vehicle. hope this helps you!

Hopefully this helps you better visualize the 60 degree guideline. You can get very technical with 'lenses,' not necessary for the purpose of learning plan projections in 2 point perspective. I'm sure this stuff will be covered later so don't worry about it too much right now. But yes, if you move your projections outside of the 60 degree cone of vision the result will be more distorted the further it moves towards the outside of the cone.

I realized I uploaded the wrong construction file earlier, here are the correct ones. Didn’t get to fully tidy it up, so some areas are still rough, thanks!

Hey @Shefali Garg, I attempted this and color-coded the lines I used to help me figure out the prongs. It's the same process as how you projected the boxes, but you may want to use another sheet of transparency paper because the projection lines get confusing. Hope this helps!

I left in the unused horizon line - the picture plane is actually the horizon for the projection….if I’d used this and shifted down the vanishing points then it would be a ‘looking-up, lines go down’ situation

Some more workings... I literally spent about 8 hours trying to make this work :)