Here's a selection of icons made from images of classical sculpture and art; the ones 'stolen' shamelessly from original art have credit-links at the bottom of this page (except for the silver equestrian statue, I couldn't find the site again for that one).  Images of the real Amazons of classical times aren't easy to find, so I hope this helps.

Modern-day Amazons and Sometimes-Reluctant Symbols
Female Temporal Power with a Side of Spiritual

Amazons | Artemis | Sekhmet | Miscellaneous
Notes and Credits

http://www.bway.net/~cstewart/NORMAL_7.html
http://zero-point.tripod.com/pantheon/Artemis.jpg
http://www.sover.net/~carving/artemis.gif
http://www.kagayastudio.com/starry/artemis/artemis.html
http://www.enchanted-art.com/artemis_large.html
http://www.gaten-project.co.jp/chiba_works/chiba_gasyu3.jpg
http://www.uky.edu/ArtsSciences/Classics/agfc-moyrsmith.html
http://www.irtc.org/ftp/pub/stills/2001-08-31/artemis.jpg
Disney

http://ew2.lysator.liu.se/loth/a/n/andrea829/sekhmet_002.jpg
http://www.usgamesinc.com/tarot/

http://itsa.ucsf.edu/~snlrc/encyclopaedia_romana/britannia/boudica/boadicea.jpg
http://www.mount.n-yorks.sch.uk/2002hist_costume_day.htm
http://www.cqfa.org/media/higgins/boudicca.jpg