[bonzelite]

with headlamps: go out to your car. look at them. move your head around the lamp and watch the light shift. and how it effects the complex facets within the housing.

then, get some dealer literature at a showroom. there's tons of beauty pics of cars and shit with headlamps in the glossy pages.

copy them. copy them until you want to throw up. then you will understand what is going on with the details. then go out and look at your own car again. study the headlamps some more. draw them; draw what you see. not what you think you see.

later, you can then make up from your imagination a sort of convincing facsimile of headlamps.

let me tell you right now that you cannot shortcut to headlamps. you will endure torture trying to understand them. you will do lots of attempts and you will hate yourself and life. you will want to die. then, and only then, you will be able to automatically draw them. they are actually easy.