I think Keenart gave the best of explanations here. I've have a few PODs myself, 4 or 5 (gosh, I'm not even sure!), but submitted a lot more! You got to keep trying, and each time, your skills will grow, and one day, no doubt we'll see you there.
On the other hand, athough it is very satisfying and is a recognition of your skills to see your work on the front page of e-on's site, it shouldn't be your goal. Making beautiful art with the tool provided (Vue for this matter) and sharing it with other users or maybe  making  a living out of it is more important.