I did a bicycle pinup a while ago because I love Serge Birault's work
At the same time, I was getting really into Fellini movies (and I especially love his wife, Giulietta Masina, in them) so I scribbled up a matching pinup on a Vespa, and then I forgot about her for a long time (new and different!) I dug her out of the dusty corners and finished her recently.
Photoshop CS5 with Wacom Intuos 4
About 20 hours over several days
Image © J. Oyhenart-Ball, 2013