Insane, that's looks really nice, I do think that you have a firm grasp of your composition. A few Suggestions if i may: I think the text you used was Times new roman, whatever I think you should give it a little more kick! I would recommend changing the font in all three of those spaces. One other thing you have, those hexagonal shapes you got over on the left are really cool! The only thing i would suggest is to not strech them out and just use the shapes themselves. Also in the backgound, it's kind of dark. You can play around with the Dodge tool to get it to brighten up if you want.
The scanlines you used on the entire image (Those horizontal lines) are taking away from the curves of the car; if you just erase the lines where they are on top of the car then it'll complement your car nicely. (Awesome ride by the way!) And on the right side with your car you might want to think about trying to make it a little brighter. Whenever i edit images with real pictures, i always go up to the image menu and adjust the brightness and contrast. Heh heh, sorry i talk too much; Last but not least, You should draw a black line around your entire image to define it's boundry. If you look at it on top of white, it stands out by itself! Phew! Awesome work, keep it up.