yea to all the above.. except when I want to make someone's lips a bit larger I will: use a skin colored liner on the outside of the lip line.
When I want the lips to appear a tiny bit smaller or more even, I draw the line inside the natural lip line.
and, when I want to highlight someone's lips, I will use a bit of either a pigment, or a highlighter cream on the curves of the lips (great for photos)