I don't know if you still accept tutorial requests, but I was thinking, could you do one on zips? (like on clothes and bags etc.) I always struggle drawing those!
I ALWAYS accept tutorial subject requests, I've added zips to the list - that's a great one, thank you so much for suggesting!
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Unfortunately the books are now sold out, BUT I will be coming back to Kickstarter with my tutorials and art books in early 2019. If you want to be on the launch day mailing list, just mail "Add me, Lorenzo!" to email@example.com and you'll be one of the first to know when the next Kickstarter launches! If you've joined the mailing list in the past, you're already on it
Huge cheers for your interest in the book, it's so appreciated!