Really? I might be blind but the set looks pretty on point almost. I would say the only changes was the chaps (thank god honestly) and the helmet. You need to understand that when someone designs a piece of gear there will be changes when it gets implemented into the game. I believe the content even mentions this so you should have expected it. Artwork doesn't always translate to in-game.
Artwork will always look better than the end result when its actually in the game because the game doesn't follow the same art style of the artwork. The same thing happened to the lost allagan set, it wasn't exactly the same but as long as I am able to identify it as the contest winner then they did a good job getting it in the game with making minor changes for it work on their engine and what they are working with. Let's be honest, did you really think they would be able to replicate the fire on the helmet like that in the artwork? If you have been playing this game long enough you would know they can't. I am actually impressed they were able to pull off the cape on the caster set. Also you need to remember this was a CASTER set contest. They didn't need to make one for the other roles but they tried to copy the style for the other roles and I think they did a good job.
If it helps for those designing the melee/ranged set try not to make something which would be hard to put in the game. That doesn't mean it needs to be bland but something that is realistically able to be implemented without big changes needed to your design. It's one of the reasons why the lost allagan set won. It looked good, matched the theme of the game and they can actually make it without too much trouble. People need to learn that when implementing gear from artwork to game form there will be small changes along the way. As long as they get a good majority of it then it's fine.
If I made a set and it won but they made minor changes like removing chaps do you really think I would be annoyed by that? They got most of it right anyway and I would be happy to see my set in the game. That's just how game development works. Things get changed for it to fit in the game and people need to learn that.