CAPTAIN AMERICA
These are some pretty neat designs, probably the best on the internet because the rest are kind of crap. It was very difficult to find good designs. Cap has to have his wings, because then it doesn't feel like cap. When you take out his wings it feels totally diferent. I'm not saying that the suit of the movies is bad but this would be his perfect adaptation.
IRON MAN
The armours designs from the movies are already fine. I love to see this in action, specially the Mark 7, the one you are seeing roght now.
THOR
I would rather see him biger and with a more classic costume and with the Helmet. The helmet is the factor that says: I am Thor, I am God! And he wouldn't have beard.
HAWKEYE
How would you like to see the first version of Hawkeye destroying Ultrons with his arrows? That design is epic. I also really like the way they adapted the mainstream version in the second picture. These are also probably the best designs on the internet. I don't know why he is underated.
BLACK WIDOW
I really liked he look from Iron Man 2, she was better than in the Avengers. But i also think that The Winter Soldier look is cool.
ANT-MAN/GIANT-MAN/YELLOWJACKET
Another underated hero that i think is epic. I liked his look from the Thundebolts but his helmet wouldn't be Black, it would be grey. Giant-man would have the same suit but he wouldn't have the helmet on. And yellowjacket would have his Ultimate Look and he wouldn't have those ridiculous "wings" he would have a small rocket backpack, like Iron Man's Mark 7.
WASP
She would have the same armour Hank Pym has as the Wasp.
VISION
Just some cool designs i found around the internet. Probably he wouldn't have the underwear on his trousers and his body would look like a robot, he would be like a living Iron Man armour. When you saw it, you would totally know he is a robot, although his face would be similar to a human's face.
BLACK PANTHER
He is alredy okay the way he is. I can perfectly see this guy on film, maybe a few changes here and there but that is it.
SCARLET WITCH
This one was a difficult one because nobody would actually wear those clothes that she wears but i think this would work.
QUICKSILVER
It would be one of those designs. I actually prefer the one that it's no the ultimate one. And also no thunders in the costume.
SPIDERWOMAN
Probably the best again.
KANG
Good job with these versions. Like them.
ULTRON
Just as simple as this and i am happy.
THANOS
Awesome designs from the Avengers extras.
That is all, tell my your opinions.