With the release of the first trailer only four days away, three more images from Joss Whedon's The Avengers have gone online.  One of the images provides the first official look at Cobie Smulders as S.H.I.E.L.D. Agent Maria Hill.  Looking at her costume and the costume for Black Widow (Scarlett Johansson), the tailor for S.H.I.E.L.D. really knows how to cut flattering outfits for the female agents.Hit the jump to check out the images.  The film also stars Robert Downey Jr., Chris Hemsworth, Chris Evans, Jeremy Renner, Mark Ruffalo, Tom Hiddleston, and Samuel L. Jackson.  The Avengers opens in 3D on May 4, 2012.Images via ONTD.

Here’s the official synopsis for The Avengers:

Continuing the epic big-screen adventures started in “Iron Man,” “The Incredible Hulk,” “Iron Man 2,” “Thor,” and “Captain America: The First Avenger,” “Marvel’s The Avengers” is the super hero team up of a lifetime. When an unexpected enemy emerges that threatens global safety and security, Nick Fury, director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster.

Based on the ever-popular Marvel comic book series, first published in 1963, “Marvel’s The Avengers” brings together the mightiest super hero characters as they all assemble together on screen for the first time.