So, sorry you had to be subjected to this "inquisition" Karen.  I too would be "miffed" to say the least!!   Who ARE they to be asking for PROOF of our OWN work simply because it doesn't look just like "last month's" style???    Where are the reviewers getting their criteria from??  It used to be frustrating, then graduated to ridiculous, but this is ludicrous!  It's hurting many artists that are professional and very conscious of copyright (most likely more so than the reviewer) and hurting newcomers with the shear amount of TIME it's unnecessarily taking to get cards approved.  Something needs to be done.  GCU is shooting itself in the foot. (IMHO)  
 
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This is awful. I am just deviating from my usual style to create some cards that will look completely different from anything I have done before. I am now worried about uploading them.
To make one of the cards I created 12 different png files, How can I upload that lot to prover they are mine? There is no place on the site to upload big PSD or Tiff files with multiple layers, so how to provide proof?
Also, I treat my original files like gold, I don't want to be uploading them at all!