Honestly if you are below 6'0 you probably dont look good muscular unless you are proportioned very well. Im just barely 5'10 and I look so short and stocky when Im muscular.
I'm 5'8.5" and really oddly proportioned-- wide hips and stubby legs and arms. I definitely look better than I did before I started working out, but I'm resigned to the fact I'll never look as good as taller, better-proportioned guys.