Everything is correct except aren't you supposed to start fresh with each note? Like, you have 3 4 under some of them. Don't you have to do 1 2, or, like I said, start fresh, with the number 1 each time? (I am not sure, I am just asking. If not, then don't pay attention to my comments :)
As an Artist I think it depends on which piece of art it is and how you feel. Personally I like charcoal. On art medium they don't really talk about is oil paintings. They don't like teaching it because it a more complex medium.They mainly focus on acrylic paintings.