Opening the image itself in a new window is the easiest way to get the URL of the image. Your URL is for the page.

On most MAC browsers it's "open image in a new window." (Option click and/or hold and wait for the menu - I forget what key command my right click adds)

In Firefox, (MAC or WIN) right click on the image and select "view image" or better yet "copy image location." Then you can just paste it from your clipboard.

In Windows Explorer, right click on the image and select "properties." You should be able to select and copy the image URL from that properties window.

I'm not very familiar with Windows. Perhaps someone knows an easier way??