This is an explanation how the BMW image was created.
First of all I must have had some image to begin with (using as a template). In Illustrator I had to draw the outlines of the object (the car) with the pen tool (). It is sometimes frustrating to use this tool and especially for beginners, but once you get used to it you will see that it is a magnificent one.

I drew each element of the car in a different layer (the order didn't matter at this time, because I drew only strokes with transparent fill) so after that I could export my ".ai" file into Photoshop without flattening the artwork. When I was done with my scratch in Illustrator I chose: File> Export>Save as type - Photoshop 5.
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