I love that you want to put your own designs to paper! First, there’s one thing we need to get out of the way: there’s no shame in copying or tracing photos, especially when it’s for your own pleasure. Since the straight, mathematical lines of a car are one of the hardest things to draw, I’m going to give you a few tricks for copying a photo of a car from the front.
Turn the photo upside down and copy it. I’m serious! Realistic drawing is difficult because your brain fights to draw a line that it knows is straight in reality but appears curved in perspective. Turning a picture upside down stops your brain from recognizing the subject and makes it easier to draw what you see.
Divide the photo into a neat grid using a pen and ruler and then divide your drawing paper the same way. Use spare paper to cover up every square except the one you’re working on and try to draw one panel at a time. You can use this trick in combination with the upside-down method.