Both good points, however me drawing while using my friend's work as reference is sort of me just messing around and having a little bit of fun, and is also just a means of inspiration for getting into a daily habit of drawing. He himself, would probably tell me not to keep doing it, funny enough.
Once I sit down and really absorb the lessons from Drawabox I'll post some post-lesson sketches of any lines and/or shapes they teach you to draw in their videos. I did mess around with some line drawing exercises while watching one of the videos, but I was kinda tired and after looking back what I drew, it kinda seemed like I wasn't taking the lessons all that serious I guess.
But seriously this drawing from your shoulder thing really opened my eyes man. Feels like I'm seeing life from a whole new perspective.