I'm trying to get accepted as a contributor to iStockPhoto. Here are the photos I uploaded:

Sunflowers: http://www.flickr.com/photos/82995064@N00/9342305755/#
Honey Bee: http://www.flickr.com/photos/82995064@N00/9342305789/#
Heirloom Tomatoes: http://www.flickr.com/photos/82995064@N00/9345091018/#

They got rejected with the message:

Comments from the iStockphoto Administrator:

At this time we regret to inform you that we did not feel the overall composition of your photography or subject matter is at the minimum level of standard for iStockphoto. Please take some time to review training materials, resources and articles provided through iStockphoto. The photographs provided in your application should be diverse in subject matter, technical ability and should be your best work. Think conceptual, creative and most important think Stock photography. Try to avoid the average eye level push the button perspective of a common subject. Try and impress us, we want to see how you stand out from the crowd.

We welcome you to return after the number of days specified and upload 3 fresh samples of your work and we will re-process your application.  Please note that you will not be able to upload new samples until this waiting period has passed.

For more information on Composition and Impact, please see:
http://www.istockphoto.com/article_view.php?ID=13

For more information on Suitable Stock Photography, please see:
http://www.istockphoto.com/article_view.php?ID=146

For more information on files that we do and don't need please see:
http://www.istockphoto.com/tutorial_5.0_neededfiles.php


I would love your feedback/criticism/advice on what I can do on subsequent applications. Thanks for your help!