Any art book/tut you can rec.
You have this Tumblr I like for easy art tutorials: http://artutorials.tumblr.com/
Otherwise, you can go to youtube, there are A LOT of great art tutorials out there. You can also follow some artists on livestream and see them draw live like Dauntdraws for instance. It's very useful: http://www.livestream.com/dauntdraws
If you are into comics, I recommend you a book called "The complete idiot's guide to graphic novel"
Good luck to you ♥