Hey there,

I am really sorry for the delay of this reply as it is a weekend for us here.

Are you move your old site to new site recently?

Because those image file seems like not exist on your server, you can access this file manually.

http://perthleadership.org/images/easyblog_articles/418/b2ap3_large_self-driving-cars.jpg
http://perthleadership.org/images/easyblog_articles/419/b2ap3_large_space-girl-space-age.jpg

If you move your old site to new site recently, you have to move over those media files to your current site, for example :
JoomlaFolder/images/easyblog_articles/..
JoomlaFolder/images/easyblog_images/..
JoomlaFolder/images/easyblog_shared/..
JoomlaFolder/images/easyblog_avatar/..
JoomlaFolder/images/easyblog_cavatar/..
JoomlaFolder/images/easyblog_tavatar/..