While I'm actually not all that enthused about the "generic face" thing in superhero comics, I do a similar approach as well, where you have more code trappings than actual facial features. Certainly the JOhn in my Steampunk picture is rather generic with hair. You have a problem though if you want to draw the characters without their props. I mean, if I had gone for drawing John as airbender I'd have probably still drawn him with hair (at least there weres ome instances Aang disguised himself with such as well iirc, so I could probably justify it somehow), but obviously if I wanted to realyl draw John as Avatar, I'd have to draw him bald and still make it look like John Sheppard, and then you have a problem if you rely too much on such symbols in lieu of actual resemblance.
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