Mustang

http://img269.imageshack.us/img269/8089/mustange.jpg

Third Car sig, second on this site, what you think?

BG dont fit to the render.. car is grey and blue, and the bg is yellow
motion blur blending isnt that good..
you need a text then :]
anyway, keep working hard and you'll improve

everything as Garis said,

dude,your sig looks like 1 of million car sigs with motion blur effect, i realy dont see anything special about it and ye, yellow kinda dont fit there, maybe try some desaturated blue for BG