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Although the internet had many illustration tips, sometimes it's preferable to have it right in front of you physically. The book is nicely designed and laid out with templates and tips to help you get the hang of it and improve. Totally consider this if you want the extra help!
I love Chris Hart's books, they're very detailed and easy to follow with great ideas and inspiration. It's so helpful for me especially when I can't decide on a certain look for one of my characters c: