2) Nitpicky thing I've noticed for a while with this model, it looks like the smoothing groups on the mesh where the spoiler is connected to the car, and the outer flat section of the wing is grouped together in a single smoothing group. I usually would put the outer face as a different smoothing group, so the flat side doesnt look like it's bending light wrong. To illustrate what I'm talking about, the sides with green lines, I'd make those poly's a separate smoothing group from the sides with the red X.