[i]Sure, I got that about renaming the example_robots.txt - am I wrong to understand that it is meant to prevent rather than prompt robots?[/i]
No, absolute correct. I just mentioned it.
I am by no means a SEO expert and most of the time I feel the importancce a little too hyped (I am google so I am?...:-)), but indeed your images don't show up.
I believe google liks "picture-of-dog.jpg" more than "Picture of dog.jpg". And it may help to enter meta tags in the head of your theme files, too.
Maybe this I just foud by accident may be of help: http://www.seomoz.org/blog/the-web-developers-seo-cheat-sheet