This got me straight in the face! Jack's personality is so well captured in this piece. I especially love how the lighting reflects off of him from the side. A little more shading probably wouldn't have hurt, but hey it's your artwork, so have at it!
I love this, great job! The lightning is really nice, although I think it might be a bit too bright in some areas. But nevertheless, this is a great piece. You've captured the fun part of Jack's personality and I'm glad to see more people who like RotG