I watched a really great documentary called Crumb last night. It's fascinating. His family is crazy! But I digress.
In the documentary Crumb showed us a book of photos. They're a collection of photographs of powerlines. These are a few of the photos from his collection:
He said something like, "You can't make this stuff up." And he's right! There are some things that you can't make up or invent... and if you try to it'll look false. That's why a reference photo is invaluable. Obviously powerlines are important to him. So he created a collection that he can use for quick reference. I love it.
Below is some of his art with powerlines in it:
Below is a sketch I did of Crumb while watching the documentary: