if that were a real URL for a picture and i had removed the ' ' in [img ], it would have worked.
in this case, you can go into the gallery and right click on the image. you then go to propertied (assuming you're using ie) and then you copy the URL for the image into the clipboard.
you then type [img ] (no space) then paste your image URL from the clipboard and then you close it with a [/img]