I don't know quite what you're looking for, but here are the ones that caught my eye...

http://members.aol.com/neyretfreres/jeanne.jpg

http://www.allposters.com/-sp/Jeanne-d-Arc-Sarah-Bernhardt-Posters_i395828_.htm

http://www.art.com/asp/sp-asp/_/pd--11846926/Monument_de_Jeanne_dArc_Joan_of_Arc.htm

http://commons.wikimedia.org/wiki/Image:Portrait_jeanne_d'arc.jpg (not quite my thing, but still nice-ish)

http://historymedren.about.com/od/picturegalleries/ig/Joan-of-Arc-Picture-Gallery/index.htm - a small gallery of images

http://www.vialin.com/jeannelapucelle/jeanneinarmor1612.html - I rather like this one, actually

http://www.columbia.edu/cu/record/23/17/26c.gif - a bit fanciful, but not horrible

http://www.jehanne-darc.com/ - I like the front image, but no armor, per se. The content of the site is slightly strange, though..

That's all I've got, so far. Hopefully not all of them were repetitions of what you've already found. :)