Like every other artist I know, even after I've signed my name, I will sometimes continue tinkering with my drawings. I can always find something to change if I look hard enough, so it can be difficult to tell when a piece is truly finished.
But remember that a drawing can be overdone! Eventually, I make a conscious decision to put my drawing away and start something new. That's when I consider my drawing done. Well, maybe…
I hope these pencil drawing techniques have helped quote join in the conversation by adding your tips and tricks in the comments.