the bumper mostly, the body itsself is abit blotchy with the highlights, but it works for the model for the most part. Id make sure to get the overlap of paint on the edges of the step too on the gunner side, you can easily see that you got grey paint on it.
Ill say this before someone says it: the hand on the gunner seat, the models like that, its not too much paint (I can say that cuz I have a speeder right infront of me im painting myself)
but all aside, do you use washes on these models? because Id use a badab black on them then lightly reapply a thinned colour of your choice for the bodies if you dont want it darkened.
Then again, Im not the biggest advocate of Clean looking models, see my wolves WIP:
http://www.heresy-online.net/forums/showthread.php?t=54246
as you can see, not the cleanest models around.
edit: I really should update the pics too on my WIP...