white porsche cayman

I found difficult to make "white" cars. I used 5H and 2H in my work trying to give this impression. For darker parts I used mechanical 0.5 pencil (2B), 5B and 8B pencil. I hope you will like my drawing. I don't really know how much time spent on it. I have finished it in 5 days( 20+ hours). The size it's A3. Comments will be apreciated