(Put a 'point of technology' - if the pictures are on your site, but linked through FR, does that really take up FR bandwidth? Seems to me they just come from your server to the browser.)
It does take up a tiny bit of bandwidth on the FR server; just enough to pass through the <img src="http://www.eggstor.com/FR_Pics/Dano-Rally322-IM000900small.jpg"> tag (yes, you do need the full address; otherwise it'll assume the picture is on FR, and that's a thumbnail of one of the Milwaukee rally pics a web-siteless FReeper sent me to post). That causes your browser to call up the site where the picture is to display it (assuming that you did it right. What is helpful is if you put the size of the picture ("width=W height=H" where the size is WxH pixels) in the IMG tag; that'll cause the browser to set aside the appropriate size in the browser while it loads the rest of the thread.