What is the best practice to get better at perspective and lines? I don't have very confident lines and a lot of my drawings since I started drawing look like chicken scratch with slanted lines.

Casper has a point, albeit simplified, try drawing simple shapes and objects to get a feel for the use of shadows. I'm no artist so I'm sure others could explain it better, possibly try to look up some books on perspective, if you're interested I have a few links to lots of art books.

um.. Draw what you see, not what you think you see.

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