Every thing is perfect... one thing (please if you don't mind) don't you think that his eyes are.... well, too cutish-innocent, but Jack's character is not innocent. On the whole, your drawing is awesome & shading is also nicely done (^_^)
wow, thats so awsome D: i love the motive you picked, not the usual standard pose we already know from the movie posters. his expression is really nice, that fascinated gaze...very nice^^
*faves*