Lower row is a collection of serial killers
except for Fabio (though there's always one atypical, charming one, isn't there?). Fabio and the others look okay except Milos, the headband is bad and he just doesn't do this type of photo well, I think.
I prefer the humorless look. Most men, and I'm including myself here, look horrible with a forced grin. Holding your chin up doesn't help with this style however.
Nishikori looks ready for a feudal Japan Kurosawa film btw.