This actually comes from the 3d graphics world, but it's useful to
anyone who can use it. One way to draw 3d is to get a side view and a
front view, trace the main lines and tie it all together. That may
seem like it's easy or cheating to some, but it just turns a 1000
job into a 100 hour job. There are a few, but this is the granddaddy
I've ever found. Blueprints or clear pics of cars, ships, planes,
humans, and much more. Have fun!!