Well, to be honest, its not quite fair within the rules set by now on the contest. Many art/model/texurers have an upper hand here, as they have the first hand on the best stuff... which only later normal people will get (eventually)
To add to the matters, I recently see a trope of Blue Planet screenies, winning contests, and overall. There are two types of shots - BP, and not related to campaigns (not a rule though.). To add things, we can pretty much state that the best of HLP are working on BP, which created a dead cycle - same people having same best stuff and posting up BP.
...no offence, no hard feelings, just thats my... sighting of late (loose opinion).
P.S. For any offended people, flame wars, etc. I am sorry, I am not best with ENG around, so I might couldn't write up things like i wanted to - neutrally, no offending.