Kev Jenkins concept art for Edge of Tomorrow has been featured here: http://moviepilot.com/posts/2014/06/07/kev-jenkins-soldiers-and-monsters-concept-art-for-edge-of-tomorrow-1485707?lt_source=external,manual#bOrIku.
He also did some concept art for World War Z.
Still, his concept art for Guardians of the Galaxy is probably his best. He was responsible for the designs of Morag, Xandar and Knowhere. There is a haunting lyrical quality couple with a hint of isolation and loneliness to all of these pieces that gives them their beauty and sense of majesty.
You can see more of his work at his website: http://kevjenkins.blogspot.com/2014/08/guardians-of-galaxy.html.
More of Kev Jenkins concept art is featured in Marvel’s Guardians of the Galaxy: The Art of the Movie.