Where I try to incorporate two things I like drawing the least, machines and backgrounds. Mainly because I have very little practice in those things, but I think they really make a drawing pop. This is among my personal favorites in my own collection.
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I like the looseness of the background and the texture of the ink where it's been sketched in. I keep seeing drawings of scenery with more relaxed line art and I want to give it a try sometime. It gives it so much character.