Impressive
To be honest there is a whole host of Mario fan art out there (and a lot of it playing off of the funny side of things), but I have to say as an artist I am quite impressed by this piece. Not only is there a sense of skill but you also managed to bring your own style and unique appearance (especially in DK and Bowser's faces) which can sometimes be lost in fan art. You made it your own and I like it very much, good work.