You can learn technical drawing. You can learn techniques of sketching, painting, sculpting and other art. You can't learn to be a creative artist. This is why you can have millions of people cranking out blueprints for widgets or illustrations of products (existing or to be) but only one Da Vinci.
Use one eye to look at a model car and don't let your head interpret the flat view that you get into the 3d object that you know it is. Now just duplicate the lines on paper. Check out Da Vinci's plain technical drawings for developing perspective. Those are not what made him great but they are elements he used within those creations that are considered great. If he had rendered the Mona Lisa with just math and geometry, nobody would remember it.