Hello,
I think long hair looks good on some men and some with long hair looks horrible. Actually it depends on the person and his personality. As for me, I can say that I wouldn't look good in long hair. May be because of my looks, my body type and the most important, my personality.
But I have seen many men who really looks good (and extremely sexy) in long hair. So the decision must be & should be extremely personal.
One thing more. If you want to grow your hair, why not give it a chance once. If you don't like your looks then you have the option to cut it short. There is no harm in it.
Best of luck:thumbs up: