Marvel Artist Draws Hulk With Creepy Smile

Marvel Studios conceptual artist Ryan Meinerding has updated his facebook page with some Hulk-centric concept art he created for Joss Whedon's Avengers: Age of Ultron.
The first image, which you can see as the article's header or just below, is the cover of Marvel's Avengers: Age of Ultron: The Art of the Movie Slipcase. The other two images were created by Ryan to show various facial expressions for the Green Goliath - even a creepy smile.