Great dynamic composition. The subject is a little hard to discern - perhaps some very light dodging/burning could help direct the eye a little more around the bottom half of the image.
OK, I will admit I had wondered about going down the cuff link route for this challenge, but having seen the quality of this shot I am glad I didnt
love the fact that whilst obviously a set up, there is a degree of subtlty to it in that it takes a while for the viewer to realise that there is an arm hanging out of the car window
Excellent focus on the tarmac and the silver of the car contrasts very nicely with the road and the ominous clouds above