Personally, I find these so boring. They've all been done a million times, and you can see them in any magazine.
Technically you're doing everything quite perfect, I just feel like the creativity is lacking.
Here's some exotic shots my buddy David Lee at
http://avantgardemotorsports.com/ did of his 08' Murcielago.
http://farm6.static.flickr.com/5217/5399122361_e7c43273d7.jpg
http://farm6.static.flickr.com/5133/5388445017_55d1c5aebc.jpg
These are how I like to see exotics shot.