Wide angle lenses only really come into their own when used for landscapes.
TBH a 18-55 will provide all the wide angle you need at 18mm and let you get close enough for most car usage with the rest of the range.
Not too sure about the blue colour cast personally...White balance FTW ;)
First shot I'd consider trying it again with a smaller aperture (larger f/stop) to knock the depth of field up a tad...
My favourite of that lot....3rd one up from the bottom.