You need a 'SRC="some_url"' specifier in your "<IMG>" tag. And that needs to refer to an online photo, it won't work (for anyone else) if it references an image on your hard drive. If you need to host a local image on the internet somewhere, use http://imageshack.us. That site is also good for "rehosting" an image you've found elsewhere on the internet, in order to give it a more reliable home (in case the original site goes down, or modifies/removes its copy of the image).
I referenced http://en.wikipedia.org/wiki/Image:Calamity_Jane_on_a_horse.gif
no go (that's Calamity Jane)
I referenced
http://www.outlawwomen.com/PokerAlice.jpg
for Poker Alice - no go
The only thing I can think of is that these addresses won't allow referencing. I'll try again.