This is completely awesome! I like how the hair/moustache/eyebrows, look realistic, I also love how the whole drawing has a glowing effect, and the little details you added to the background, such as the red shell and mushroom/blocks just add to the whole surroundings and image of whats going on behind him, The effects around the hands are amazing and beautiful, enough said. Your shading is excellent and in all the right places as far as I can see, and I really think this shall inspire many artists, I can't wait to see more of your works, best of luck to you!
I love both mario and luigi but I personally think luigi > mario. His quirky personality makes him so much more interesting than mario :3 But that aside, THIS IS SOME AWESOME-ASS ART! Seriously love the intensity you give it.