I realize that I wandered into academic-ish style in the last post, but really what I wanted to ask is: "Is there any better approach to learning how to draw than just practicing at random?"
Like, are there specific forms and things you should practice, or do you practice just making lines at first? Is there a drawing equivalent of practicing the scales, or those level 1 Suzuki books full of traditional children's melodies? I feel like this is the sort of thing it ought to be possible to actually learn, but have never had a good guide.