Haha. Twilight = heart Awsome book. Stephanie rules. I met her in Cincy...
Anywho... Pretty good line art. The hands are very well done for a liniar interpritation of the cover.
The only thing I see that could be worked on is the size and shape of the eyes. Exam the shape of people's eyes- you'll realize they aren't the perfect almond shapes we're taught in school. Ditto with the nose.
Oher than that great job. I applaude you for doing realism. Realistic artists are hard to come by around these parts of the internet. Kudos for going against the grain.