No one says you have to draw exactly what you see when you’re making studies on location. I was sitting in a museum drawing cars and trains, and I wondered what they would look life if they reared up on their hind wheels or inflated with a big breath of air.
Being on location lets you see the objects in three dimensions, walk around them, peer under them. That’s the first step to understanding their forms so that you can transform them any way you want.
A tip: try a little thumbnail sketch first before you leap into a larger drawing.