Will be interesting to see their view on it. But as a safe guard to yourself, contact the photographers of each image. That way it can be shown that you have done everything in your power to conform to any copyrights law etc.
I've only been uploading images to stock.xchng for just over a week, but I've had quite a few official requests for use of my images. None of mine have any models etc in them, but people still request permission?
Example from today http://www.alamut.es/bizblog
It's only a macro shot of stones put in his blog, but the guy was kind enough to ask if it was OK to use and gave links to my site