A couple days ago one of my Absolute Beginners students came to the studio for some follow-up lessons. She had been practicing in the intervening year and had also bought some books containing lessons. They were fine books and she had learned a lot from them as you can see from the work she produced that she showed me.
Nevertheless, if a picture is worth a thousand words, and a youtube video a million, then sometimes a little bit of extra in-person instruction is priceless. Sometimes I’ve shown students the difference between the brushstrokes they’re making and what they need to do to get the effect they’re aiming for by making the two types of brushstroke on their inner arm. Often it’s also picking up on the slight difference between to two in order to guide them.