Looking for car concept artist

I have a book about cars coming out, I would like some artist to do a few drawings for me for it. mostly body work sketches.

The level of talent / Quality i'm looking for can be displayed in the links below:
http://fc03.deviantart.net/fs24/i/2008/015/1/4/Porsche_Sketch_by_kaka_22.jpg

http://fc07.deviantart.net/fs40/f/2009/018/b/0/b02acfcfc9754a9f61ca9e52ebbdfc84.jpg

http://fc08.deviantart.net/fs71/i/2011/116/2/3/bmw_sketching_by_cyril_design-d3eyfpk.jpg