[Trivia Tim]

Not particularly hi-res (800x600), but good enough for most purposes is the Chinese website Autohome. It has millions of photos of all cars available in China, both Chinese-made and imported. It's where many regulars here get their pics. One disadvantage: all photos have 'Autohome' printed in the corner.

Go here: http://car.autohome.com.cn/pic/

You can find manufacturers in the scrolling menu on the left.