This piece, the New 52 Captain Atom, is by Raymund Lee. He is an artist from the Philippines (here’s his DeviantArt page). I really think it is possibly the most beautiful rendition of this particular version of Cap that I’ve ever seen. And he doesn’t stop there. Below are Dr. Manhattan, and Captain Atom’s “pals” Blue Beetle and Firestorm.
He has lots more superheroes on his site; this is just a small sampling.