The mazda RX-8 broke the tradition of needing a B beam so its not essensial. I would agree with the shark fin antenna (google image it - easy to make and u can just pop it on top 5 min job) and wipers its all the little details that i think make an image go from good to great.

Ive also noticed that the wing mirrors are tiny. just scale them up a little.

I would love to know what your workflow was on creating this... did u make each individual part (bonnet, bumpers, fenders, doors...etc) or did u make the whole thing and break it down to parts after?