Whitehorn, add the names of the entrants please.
personal comments:
entry #1:
Easy concept, poorly executed. The textures are flat, most likely made with filters, photos or pre-mades, wich usually dont give the best effect for wc3. Also, it has a complete lack of shading. The shells and seastars on the shield have a lot of realism and detail, yet this fails to echo throughout the skin. Also, the lack of a portrait photo bugs me.
1/5.
entry #2:
Quite orginal. But, the texture is flat, most likely done with filters, pre-mades or photo textures, wich, as mentioned above, do not give the best results. The top of the head is a mere recolor of the original skin, wich gets you points off. The seaweed on the wings is meant well, but doesnt come out quite right. Maybe the model is to blame for this as well. In my opinion you could have done something interesting with the hair reather then remove it in total.
2/5, but only becouse the model is out of the ordinary.
entry #3:
Really original, i like originality above all in a concept such as this. It looks quite decent, but i think you should have looked at the mountain giant texture for reference, as the stones dont look too well. The black is too black, and the rocks could have used some consitant highlighting. The eyes-on-neck thing is interetsing, but i fear your portrait will look reather bad. For not taking in and showing a portrait photo, this seriously harms your score.
2/5.
entry #4:
Interesting concept, it came out reasonably well. The ice textures on his shoulders are up to quality, those look pretty good. You should however have taken into calculation that the shoulder ice looks way more detailed then the one on his "mane", the mane ice looks really funbled and blurry. You should have made that a lot bigger (the texture scale) for the sake of continuality. Besides that i think that the blue stones or scales clash with it a little bit, i would have liked a higher contrast there, or a diffrent kind of texture. It looks quite simulair to the ice. But still, diffrent enough for it to look "seporated" from eachother. I dont like the weapons handle, you should have brought that colore back somewhere else in the skin, it looks quite lost.
3/5.
entry #5:
really nice outcome and concept. I like your presentation as well, complete with portrait, blp and before/after shots, the only thing missing from that is the in-game shot, i would have liked to see those edited emitters in-game. The helmet on this is really nice, making it a scorpion was brilliance. The bone-ish-ness of things could have been better, it still looks a little like metal, but due to shape it lookes like bone more then enough. It has the right sense of detail, the cati came out reather nice due to the added spikes... The cow hide still looks a little bit out of place though, it looks completely seporate from the rest due to the completely diffrent colors. You could have made the grey cacti the color of that cow hide (or a nice desaturated in-between) to make it look more as a whole.
But still, really nice entry.
4/5.
entry #6:
Another revenant... but i'd have to say its both of your faults really. This one came out pretty nice as well, it looks quite woody enough. THe leafs on the helmet look a little bit like ears though, and i think the green is a little bit too neon, the green on the shield looks loads better.
Whats killing this for me is a completely wrong frequancy, WAY too much detail that will be killed in-game anyway. Should have made the leafs a lot bigger. What kills it even more, is the use of copy-paste on the leafs... this lame copy-pasting is just not worth it when dealing with textures the size of wc3 ones. On higher resolutions it can be rewarding, but with wc3 you are better off painting it all.
2/5 due to two major mishabs.
I vote #5 (sand revenant thing.)
Its just clearly the best quality overall. By far, actually. | 
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. Well, i´m going to vote when i come back from the university, i feel very sleepy 
. And erwtenpeller, i´ll keep your critics in mind so i can make a better skin for the next contest, so thnx for you too.