I've read a blog about one of the artist there saying two his portraits got declined. He then re-submitted the exact same photos without modification a week later but in another category and got approved...go figure? I tried to do the same thing recently just for kicks but the photo I submitted got declined twice; and I thought it was better than some of my approved ones.
I'm not a pro by any means and still learning but I've seen submissions that were "surprisingly" approved. I mean, we're talking about an artist armed with a K7 and a Tammy 28-75. The IQ of his approved photos were no better than what my 6-year old can get out of his 3.2 megapixel Olympus P&S. One of his photos appear as if he had a foggy lens and yet they're up there in PPG representing Pentax. One thing that improved significantly with PPG is they're pending time has dropped from roughly two weeks to about three days.