If that is all custom, then you have improved vastly, if not it still looks pretty damn good. Keep up the amazing work. One nit picky thing though, on Dk's right fist, where the grass is supposed to cover it up, it looks more like it has been erased. It doesn't distract from anything, its just something I noticed.
I really didn't want the ESRB, Nintendo, and Wii logo to get in the way of the box, but I still wanted to somehow artistically include them, so this is what I did. I wanted them to be small so they wouldn't take away from the box.