Disclaimer: the images and artwork here are not my work but are shown as examples of classic pin-up art for prospective models. Credit given when known.
Particularly noteworthy are the images by Gil Elvgren, arguably America's best and most prolific pin-up artist, whose career spanned several decades. Also very much worth noting in the history of pin-up art is the work of Irina Davis, whose clever high-key images (several included below) are all of Russian immigrant women in American pin-up poses. Her interesting statement on why can be read here: http://www.irinadavis.com/statements.html