Did you think the awesome look of the Avengers movie just came out of thin air or from the creative minds of the people in Hollywood? Like most things in the film industry, especially involving Comic Books and other source materials, the look is best achieved when relying on artistic talent from outside the cinematic world.
The Avengers look was based on the concept art of Steve Jung, who’s works were also used in the creation of the visuals for Tron, Transformers 2 and Thor.