This is a really nice painting. Love the way his eyes' glow reflects off everything, especially the horns on the mask and the nose/beak on the Skull Kid. Oh, and the Skull Kid's hat, too. I think that the Ocarina looks a little.... fake, though, like it's made out of plastic or wax. I'm not sure what about it gives it that feel. But overall well done, especially on the Skull Kid's face. The color composition is also very nice, with the blue background complimenting his orange hat in a very... geometric way.
Wow... I mean, no words can really express how much I am fanning right now. Majora was a great villain and taking the innocence of a Skull Kid. Though he was probably kicking himself when Skull Kid started out with some pranks before he started dragging the moon to the earth.