Images on About us Page

Hello,

I’m using your layout for the about us Page, but when I put the image url inside the shortcode, nothing appears. Here is an example of what I’ve done:
[column width="four" position="first" ][person name="XXX" picture_url="http://www.XXXX.com/wp-content/uploads/2013/01/gloria-261x300.jpg" title="Founder, CEO"][/person] [/column]

Can’t seem to figure out what I’m missing.

Thanks for your assistance