I am about as genuinely Not An Artist as it gets. People who can draw seem to me to be channeling a god who snubs me. I loved Brian's post, and I love any illustration that an artist does which shows his/her process. It remains a very mysterious process to me.
But I did copy a car image one time. Brian's post inspired me to haul my 1976 embroidered denim shirt out of storage.
I miss the old ten dollar bill. The engraving on the back, of the U. S. Treasury building in around 1928, is just delightful and so much more interesting than the new serious designs. One element that always enchanted me was the little car on the street. I always thought it was a Model T Ford, but according to wikipedia's article on the bill's history it's no particular model, just a sort of generic car of the era.
I traced it onto the shirt with a pencil and embroidered it, taxing my artistic abilities to the max, while I watched the Ford/Carter debates on the dorm-basement TV. Did a so-so job on its proportions, but, hey, it's not a real car anyway, so accuracy is irrelevant!