Unfair rejection? You be the judge!

I recently joined Photocase in hopes of exchanging some images with the community. Granted, Photocase has SOME high quality images by people that obviously take photography more seriously than I do. However, what I experienced was a total denial of every image I submitted. Now, I don't mind rejection, I can take it when it's fair and accurate.

I submit for you below some images I found accepted at Photocase and then show some of the 18 I submitted.These are all minimum resolution of 2300x1800. I am just trying to figure out what I did wrong! If you feel I have been fairly judged, then let me know, by all means.

First, some Photocase images
Now, the images I submitted
Clicking on each image will bring forward a high res clip of that image to show the quality.
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If you're interested, you can see a complete photo album of most of the mountain shots (although lower resolution) here