Going back to what you did 10-30 years ago take some time. Especially when its about producing art with your hands. You need to update the brain so your hands do what you want it to do. I personally practice by using my smart phones simple Memo app to produce daily sketches . You find them in a separate gallery.
Did choose a car as Formula one just was started the 2014 season. But my painting is my version of our Spanish Fernando Alonsos older Ferarri.
Half done on this pict.