I think your idea and concept works well. With just a few more adjustments I think you're on your way to a good design. Below are some critiques that can hopefully help you towards a positive direction.
Subject: Car
- The rear tire width of the vehicle appears to be very thin
- Because there are no shadows towards the rear, the car appears to be "floating"
- The angle or perspective of the vehicle is slightly offset relative to the ground
- I would also suggest coloring the vertical grill on the front bumper (as noted by ediddynsx)
Subject: Top-most text
- The white text on the very top may need a little more attention to kerning, tracking, and specially word spacing. The spacing between each word affects the natural flow of words readers are used to.
- The font that you used is ok. But I would encourage to experiment a little with simpler fonts such like helvetica, arial, and gill sans and play around with their attributes (ie. point size, bold, italics etc).
- I like how you are experimenting with color within your layout, however because your composition already has a spectrum of colors I would discourage introducing a new color to the mix (referring to the color of the date). It starts to take away from your focal point and affects the hierarchy of the composition.
- There are also some artifacts below the "OCT 2010," that I would clean up. The artifacts may be due to exporting as a low-res image. But if its in the image I would do a quick pass with clone-stamp or healing brush tool and your good.
Subject: NSXPO 2010
- I would highly discourage the use of bevel/emboss and outer glow (unless used effectively with subtlety). It's a common effect used by new designers and calls out "amateur." But its ok, I also used it in my earlier designs thinking it was such a cool effect.
- Due to the background image being so busy, the nsxpo logo becomes difficult to read.
I hope my critique helps. If you have any questions, feel free to ask or pm me. I'd be more than happy help.
Keep up the good work!