dforrest, sorry you are having problems posting images. You appear to have put them correctly in the post, but the way you have your hosting setup to provide hotlink protection (which stops other domains linking to your images to reduce bandwidth usage) may be the problem.
You appear to be hosting with a company called Servage and they have instructions on how to disable this here: https://www.servage.net/wiki/Hotlink_protection
Alternatively you could host the file of a service like Flickr or Pictr.com and link to it from there.