Avengers-Thor

The mighty Thor! Not entirely satisfied with the result but,if I'm going to get through all of them before uni starts, I need to keep moving. Any advise for improving in the future would still be handy.
Photoshop + cs4 ~ 10 hours

Loki - [link]
Hulk - [link]
Hawkeye - [link]
Black Widow - [link]
Nick Fury - [link]
Iron Man - [link]
Captain America - [link]

Prints available at RedBubble: [link]