Here is one for you 
Where To See Pictures Of Greek Gods/ Picture Of Medusa?
There are so many here www.google.com I hope one of them helps :) I would have posted some pics here, but the most detailed nice ones were nude or would be found offensive. So I tried for a decent one below....
Search Mythology ( Greek & Roman) can't suggest any good ones personally, if you type in 'medussa' into wikepedia search, likely results. I hope someone suggests something better, that is all I got.