Congrats on completing the challenge. I have one big recommendation though - draw bigger. You're cramping these into such a small space, and it makes this exercise far more difficult than it needs to be. Give your brain more space to think, and for you to use more of your entire arm when drawing.

Additionally I can see a bunch of places where your lines have gotten kind of hairy from drawing over them a lot. Line weight is one thing, but some of those look more like you just automatically went over them because maybe you made a mistake or you weren't confident with that line. Don't correct your mistakes, and don't reinforce your lines automatically. Draw them in a single motion, and then when you come back later to add line weight, do so using the ghosting method again, and don't overdo it.