Hello there! I don’t think the vehicle is actually wrong. However, because of the perspective and viewing angle, it can feel a little strange. This happens because the vehicle is positioned fairly close to the horizon line. When objects are near the horizon line, they tend to appear flatter, especially in one-point perspective setups. Take a look at the example I added (I found it on Pinterest). Notice how the vehicles at the top look almost completely flat because they sit directly on the horizon line. Because of that, we mainly see the front plane of the cars. The third drawing, which is more similar to your angle, isn’t extremely close to the horizon line, but it’s also not far enough away for the volume to become much more visible. Then in the fourth drawing, the vehicle is farther from the horizon line, which allows us to see more of the top surface and even a bit of the back of the car. So overall, it’s not that you drew it incorrectly. It’s just that because of the viewing angle and proximity to the horizon line, the form naturally appears flatter, which can make it feel a bit odd visually. Also, the way you measured the proportions is actually really good! You could try doing the same exercise using 2-point perspective. I think that approach could make this method of measuring proportions even more effective. I mean, to measure the length of the car. Hope this helps!
