Regardless of how much you think you messed it up, you did a great job man. I have to say, I love this piece, and I think (yeah i'm turning this into a critism sorry.) that if you do decide to fix it up, try to keep the edgy/haziness to the piece. I feel that the haziness kind of helps it build the feeling this piece portrays. It really sets the mood of that scene quite well too. As for the colors, spot on in my opinion.
Overall, GREAT job man, and keep up the good work brother!