Here's 3 Sites I use for reference when modelling.

Organic things - www.fineart.sk

*** Warning *** Above sites contain nudity, if you're underage and is offended by such contents please do not click on the link, they are picture intended for artistic reference material, not porn.

Cars/Weapons/Planes - http://www.onnovanbraam.com/index.ph...e&group=update

Cars/Tanks/Planes/Ships - www.suurland.com

Enjoy!