Just an observation here, I wonder if you have a similar experience...
When I hit the home pages of the 15 or so sites I contribute to, many have these cool filtered, anit-compositional, occaisionally oversaturated images. I love them! Of course, those are exactly the images that get rejected when I submit something similar.

No bitch or gripe here, just an interesting musing...
By the way, has anyone noticed that CanStock and Fotolia have the same woman on their home page? She's there all the time on CanStock, and part of a group that goes by in the Fotolia slide show.
Cheers,
Scott