References, and observation.
Recently, someone asked me to draw a tractor, and at first it was ugly, because i didn't really knew how a tractor really looked like, so i just drew my idea of a tractor: 2 little wheels, 2 big wheels, a cabin on top.
But if you search "Tractor" on Google, you can see that there's actually much more.
So this is my advi......
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