Larger images are hosted on another server, like Flickr, and embedded with "tags" in the page. The size of the image on the server determines how big it will appear on the page (generally, unless an add pushes it smaller)

here's some code without the parts that make it code. I've removed all the opening and closing square brackets.
What shows up is below the code

url=http://www.flickr.com/photos/ccorlew/8843193789/
img http://farm6.staticflickr.com/5327/8843193789_17fb8a49f8_z.jpg[/img /url
url=http://www.flickr.com/photos/ccorlew/8843193789/]Tricia Carquinez scenic drive posterpedal/ url by url=http://www.flickr.com/people/ccorlew/ ccorlew[/url , on Flickr


Tricia Carquinez scenic drive posterpedal by ccorlew, on Flickr