So awesome. Both of the costumes are really good, and scarily similar to the movie. I'm deeply impressed.
Love the details on Loki's armor. Just astounding.
I also love the hair color for Natasha here, because with most Black Widow cosplayers I've seen, it's either real red (like Crayola crayon red) or it's not very red at all. I think this one's just about perfect.