I just saw this image of Superman and thought I'd post it for viewing and comments.

I think his body is much too slender for the style of costume. I think the emblem on the chest should be much broader to give the appearance of a broad chest that he doesn't have, which would in turn, give a believable difference in the Clark and Superman. Also, maybe extend upward his brief, and/or give hime a wider belt to once again enhance the look of his lacking physique. Just my two cents on a quick observation.