Here is my Tie Fighter, but because of the colors i used im going to call it a Republic Tie Fighter. I actully like the colors though this could easily be done in black and blue(though really the real ship is gray, just watch the movies)
I think the shape could be improved, and that you should try the 2x2 dish for the front of the ball. Not sure I like those pieces for the wings, kinda make them look fat. Interesting cockpit design though.