Hi John,
Welcome to OPF, glad to see you here.
This is a rather nice picture, I like it. What especially caught my attention was the tough look of these guys. Do you know them or were they total strangers? If so, then how did they react to their picture being taken? ;-)
Re. B&W vs. color, I like it in B&W. As Bart says, one can easily imagine the tropical colors of the shirt after all. 
Cheers,