I was starting to wonder why your gallery dropped off the front page, that doesn't happen very often. This is a great start, especially with the huge update. Most all of these pictures are good but here are some standouts.
In real life, the C5 Z06 was a great handling car and could out maneuver cars costing twice as much. The #1 photo makes that known--it looks low, wide, like a race car, just ready to destroy that corner.
I really like the many colors of #4. The blue sky in one corner, the blue curb in the other, and right in the middle is the red car with the bright yellow line. That's a nice, luxurious color blue on that curb, too. This pic is reminiscent of a real one I have of the C6 Z06. It was from Automoblie Magazine, I believe.
For some reason I really like the combination of the red Vette with the gray/brown back ground in #5. On most round lights in GT4 there are a bunch of jaggies at the edge of the light. They aren't very noticable in this picture, though. Overall this is one of the most flawless pics in this set.
My opinion about the green tinted #9 photo is that it's, well, ugly. Sorry about the bluntness of that comment because red and green do look good together, especially during the Christmas season. But only if they're seperate colors, because if one has the tint of the other, in this case the red is tinted green, the results are usually just ungood.
The best aspect of the 13th picture is it's background. I dig the hue of blue that adorns the sky, and the bright shimmer of the enourmous granite El Capitan looks nice. Your signature goes especially well with the colors in that pic.
And then there's good 'ol number 18, which is by far my favorite. The angle, contrast, reflections, the fact that it's one of those partial shots, all make it the best of the set. On the front of the car there a a lot of lines I would have smudged smooth, the front wheel arch, for example. But the compostion and presentation of this photo makes up for a few jaggies.
Probably the fastest looking pic is #20. I like the combination of im and tire, that looks like a combo one might get for the real car. The curve of the blur is odd, but that's why it's good.
The deep contrast of the 21st pic really stands out, along with the simple straight lines that I'm a big fan of. But the whole car has slathered with rough lines. It might take a little while longer, but I can wait an extra day or so for higher quality pictures.