nomis5 - 3:30 pm on Jan 26, 2012 (gmt 0)
Reading the Matt Cutts article and the link on that page, it does sound like the criteria is just how much space the ads occupy. No mention of what type of content needs to be on the non-ad part of the page and no mention of how images are treated.
That makes sense really because it would be very difficult for any automated process to distinguish between different types of non-ad content. And to penalise the use of pictures wouldn't make sense either.