I heard that this got a daily deviation award! Congratulations! Okay, let's get down to it.
Vision: Graffiti is considered a rogue breed of art all its own, but if you're the one that made this, then you have some serious skills. Four and-a-half stars. Originality: Graffiti is also, if I'm not mistaken, somewhat of a dying breed, but this is definitely original, in my mind. Four and-a-half stars. Technique: Assuming you're the one that made this graffiti artwork, I'm pretty sure you took your sweet time on it, and it shows. Five stars. Impact: Who wouldn't fave this? It's a masterpiece! Five stars.
Overall, I believe that, based on what I see, this is your best work so far. In fact, I like graffiti to such an extent that I may just search the word itself on the DeviantART search page and see what I can find. Keep at it, man! You're doing really well!