Pretty vs. Attractive: Reflections

Is there a difference between being pretty, attractive or beautiful? Which model on the right is "pretty"? Are they both attractive? What features make someone beautiful? I explore these notions in this show.

For insight from others on the topic, check out the following blogs and webpages:

http://laura.moncur.org/archives/2006/08/03/good-looking-vs-attractive/
http://www.communicatrix.com/2006/07/good-looking-vs-attractive-a-deconstruction.html