Agree, they're very Unrealish
I like number 6. The armor is very nice, but however not very organic if that's your aim. Infact most of the armors don't look organic because they're very symmetrical and lack features that are easily associated with living things. The 3 is also interesting. The shoulders have very organic feel to them, like a critter sitting on her shoulders.
Your fav, 3rd is interesting style. I prefer arms of the 7th more, but the proportions are better in 3rd. I like 4 most
If you consider the top left end as womans head and the body as some sort of gimp suit like alien orga... I mean it reminds me of GLaDOS or a twisted body sack.
#6 is my absolute favourite of them all. The hanging spikes look great and I like the gloves very much.
Maybe you could fix together different leg pieces from two different concepts to create more organic looking armor. There are alot of armors which sort of 'fit' together.
Oh and page 3, #1 has great legs. Hind legs rock.