While looking for drawing tutorials on YouTube, I've stumbled upon Alphonso Dunn's YouTube channel and learned about his books.

As I like pen & ink and would like to use it, I've decided to order the books and learn after them. So far I've managed to cover around 3/4 of the workbook (the second book), but lost steam after that. I still plan to finish the workbook and also try some of the exercises from his first book at some point.