Exactly, it's all about the intended use.
For who is it being drawn?
How is it going to be published?
What is the user going to do with the illustration?
I have been drawing for RC Scale models for thirty years and have had a lot of contacts with competing Modellers and pilots and a lot of them find nothing more annoying in drawings then:
Shadows, reflections, wear and tear and paint abbrasion.
I have to say though that I couldnt draw these profiles myself anyway, I have only have experience with computer artwork (not sure about this one). I however am interested in doing this myself and will try and learn the skills to do this.
But again my customers don't really need this, and to be honest I don't make anymore for these exterior drawings, but no more money ...