Recently I stumbled across a really interesting site, www.beaudaniels.com. The site features very technical type drawings of many different objects/subjects. Definitely take a peek if you have the need to work on a sketch that is more technical and or of a tight/finished nature. Although most of what they have is not very “id” related, it is nonetheless very cool to be inspired by the detail, time, and effort of these amazing drawings. I found the content to be very fascinating and I am definitely saving the link for the future reference!