It's a strange beast, home video packaging. The standard DVD cover has a great split-six graphic with each hero getting a section (sans Black Widow and Hawkeye, who are partnered in the final box).
The four-disc version is a smaller-sized version of the film's theatrical poster. Stylish, gets the whole main cast in.
And then comes the DVD/Blu-Ray 2 packs, both with the same image (in different border covers)--a horrible, slapped-together Photoshop of Chris Evans's face obscured by some bizarre "zoom!" hand gesture (faceguard on), while Downey Jr. stares at the viewer, helmet completely missing, lit very brightly. Meanwhile a graphic of CG Hulk and what was likely an alternate theatrical image of Hemsworth as Thor, shadowy and gleaming.
Black Widow? Hawkeye? Fury? All missing.
It's as if Disney/Marvel wants you to avoid buying these two covers in favor of a standard DVD or super-deluxe 4-disc set. The biggest sales are likely to come from the 2-disc sets, so why even screw with making up a cover like this?
It reeks of amateurism. Makes you want to buy it and print out a copy of the theatrical poster and stick it over it so you don't have to look at this horrid design ever again.