It looks like you have two extra spaces (beginning and end) and an unneeded semi-colon (at end) in there.
Also, your URL includes "My Documents" which may be your problem. The photo URL should end in ".jpg" and be hosted on a website -- if you right click on a picture, then choose "properties", the link is identified there. Copy and paste that in between the quotation marks, after img src.
I'm an old dog who can learn new tricks but only slowly, or with an occasional whack with a newspaper.