Good effort! I like it, carbon fibre looks great. Just some problems:
- Car body needs some reflections and the greeny colouring from the background (Chop with effect improves it a bit).
- Some bad selections around the car, like the roof for example, the edges are jagged. If you are using the pen tool in Photoshop make the selections feathered, about 0.3px - 0.5px.
- Front lip looks a bit flat, needs some shadows on it.
Keep it up, you should be intermediate soon!