You can either post a link to a shared online album with a service such as shutterfly or post a direct link with a service that will allow direct linking such as photobucket or any personal web space you have. Format to display the direct link image must be as follows:
[img]complete%20url%20of%20direct%20link[/img]
Here's an example:
['img]http://www.bigskycichlids.com/images/Ngracilis.jpg[/img']
Removing the 'quotes' marks and the image will display as below:
If all else fails, email the image and I'll post it.