Minimalist - Avengers Logos: Shield, Captain America, Hawkeye, Hulk, Iron Man, Thor, Black Widow
XCV_ARM CONCEPT by Cristiano Rinaldi, via Behance
Now this is a helmet
WWII era aircraft - Japanese Zero, P-40, two P-51 Mustangs, Corsair, and a B-25. All part of the Texas Flying Legends collection.
Spider-Man: Avengers Alliance Alternate Costume
Agent Venom - Avengers Alliance
Amazing Avengers Watercolor Series - who's your favorite?