Does this beloved character need an introduction?
If so, that's definitely my bad. ;)
I'm currently working on a game in wich human character sprites are about 20x20px.
This scale is very challenging to me, that's why I'm trying as a self-dare, to pixel the rarest things and characters scaled to this size, just for fun and to improve my (Alas!) poor skills.
I think it should be displayed at 4x.
I hope someone enjoy it a little or at least evoke a memory of the movie. | 
Thanks, that's an interesting suggestion, thinking it back, sure the "S" logo is more iconic and the suspenders are just a little detail, and also that to be more realistic maybe it shouldn't register, but if we don't mind to go a little cartoonish, and we would like to add that little detail, I think even if ithey are not worth of the spaces wasted, we could leave the man's pants securely held, as I fear is not possible to oversize the Superman logo on the t-shirt. ;)
I apreciate the comment, and I'll keep it on mind in the future. Thanks again!