There are a lot of really good tutorials on YouTube on freehand sketching for beginners. Several on sketching cars and one I found specifically on the 911. Whether it's sketching a person, a dog or a car, it seems to all start the same: knowing where to draw some baselines so the proportions are right.
On a somewhat related note, I've been helping some neighbors clear out a hoarder house down the road the past several days. The guy went into assisted-living and was a renowned artist. His thing was mixed-media collage. There're probably 100+ pieces of his artwork matted and framed in the house. It's stunningly impressive art. Relatives said they didn't want anything and just throw it all in the dumpster
We found an art gallery owner to come out and take a look and he said many of the pieces are valued at $1500+ (he's taking it all and selling it on consignment, thank God). The artist mind works in a different way for sure! Photos don't come close to doing it justice.
