Is the reason we never get to see Dredd's face because the comic doesn't want us to see it, therefore giving that air of mystery or is it because Dredd doesn't want us to see his face? Yeah I know Dredd is just a fictional character and not "real" but over the years we've got to see how his mind works. So does he keep his helmet on because his face is all messed up (doubtful with all the face change technology available) or because sometimes he wants to go outside in normal clothes minus helmet for a quiet cup of synthi-caf without fear of someone having a go at him? Or more likely is it because his helmet is stuck and that's why on the occasions he's been captured by the likes of The Angel Gang, Captain Skank, they've been unable to prise it off 'cause it doesn't seem to come off even when he's strung upside down. Now if I was a evil bad guy and caught Dredd the first thing I'd want to do is see what the old bugger looks like (I knew you'd say that :-)
