Wow that is a difficult question to answer. Remember there is a left side right side brain pattern to start with. One thing when it comes to free hand art is getting use to looking at everything
from a perspective opposite from everyone around you. I know for a fact other artist that do work along the same borders as mine see or find them selves constantly seeing things with
acute and obtuse angles. For instance when I look at vehicle I look at all angles plus curves at the same time and make mental notes of rivets and just how many. Small items become
mental measuring points stored away in my small brain. If I look at a building I'm looking at it solely using acute and obtuse angles. Hell I find myself watching TV and I'm lining things up
while I'm watching, something I just automatically do and can't stop.
When I start a drawing I'm probably one of only one that draws the way I do according to other artist, I'm a total odd ball and everyone says so.
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I start a layout with 4H or 5H pencil but
the odd thing that I do and apparently no one else does is I start with the front wheel and work three angles at once. In other words front wheel first then in this order, bumper, fender opening, grill, top of hood,
top of fender, center of windshield then sides, visor, top and back of cab, air cleaner, door and mirror, fuel tank, right front wheel then rear wheels and quarter fenders. And that's a fairly
detailed layout the way I want it. Then I go over it with free hand in ink using {Pigma Micron Pens or Faber Castell Pitt pens that come in shades of gray. The best thing to practice first
is just drawing circles and ovals and straight lines free hand. Then start drawing ovals using a mental vanishing point, I never use a real vanishing point using a ruler, because although it is
a true vanishing point realistically no one sees it that way. It's all practice-hand-eye coordination making the pencil do what's in your mind.
I will finish by saying what I do in ink has to be right the first time, there is no eraser.
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Hope that helps if no I can give you some other ideas too.