Ooh ooh I googled finding image properties with a mac and found two ways:
1. To find out, hold down the control key and click on the image. Choose Copy image address, it will be put into the clipboard. Then just paste the image link. (NOTE: Please upload it into and image hosting site (ie. www.photobucket.com). If you don't, you will be putting extra bandwith on the site you got it from, which if they don't have unlimited bandwith, they would either have to pay extra, or have their site shut down.)
2. Another thing you can try is under the VIEW menu select "status bar"
this will display a status bar at the bottom of the safari window. once you mouse onto the image look at the status bar it'll tell where it links to.