>Cry-Baby isn't a big scary intimidating guy, he is a nice and sweet one!<
Cry-Baby, the character, is seen as dangerous, an outsider, a threat to all decent citizens. The joke of the John Waters film is that to our eyes he's about as threatening as a Pat Boone record, but it reflects that certain mid '50s fear of anything outside the norm, as well as Waters' love for outcasts and deviants.
The poster for the Broadway musical, in my opinion, is brilliantly tongue-in-cheek. I don't think it makes Cry-Baby look big and scary, since the other people in the ad are looking at him with either extreme admiration or cartoon horror. The colors may not be colors that are in the show, but they instantly conjure up a a million pulp novel covers and b-movie logos. It is a great great piece of art and I think, tone-perfect for what I know about the show.
Begin at the beginning and go on till you come to the end: then stop.