why on earth do you want a pic of a black bumper!!!! 
I'll get some all the same!!
well if you take some decent macro shots we'll be able to see just 'how' black they are, whether you got into all the nooks and crannies etc...
as 88 said... it's always useful for comparison...
something like this 50/50 would have been ideal so you can see the old and the 'new' in the same shot
