I see a ton of people constantly struggling to draw and sculpt lips. I think I'm going to have to make a tutorial on how to avoid getting duck lips and I'm going to put it on here. In the meantime, here's a drawing (with some fairly exaggerated features) that ought to help.
http://forums.cgsociety.org/showthread.php?f=199&t=269026 Check out this book from your local library, and check out this thread; along with others at CGSociety. Your drawing could do with alot of improvement, starting with drawing closer to life and reference. That doesnt mean it has to be lifelike, but you should pay…