Maybe it was requested by the commissioner of the piece, but I find the little flash of Lois's stocking top a tad unnecessary. You've made her sexy enough without that.
Minor gripe aside, it's an excellent piece. I agree that there's a Byrne-esque feel to the Man of Steel.
I'm digging the tight rendering and the very classic looking Superman. This is very much what he should look like. He's not just any good looking guy the way some draw him.
One quick crit though...his abdomen bother's me. Maybe that area cold be a little bigger...more fabric or something...It like reminds me on an action figure the way it is now.