I'm about to do a web design for a cage fighting promoter. Can I use one of the photos I took from the event, as a graphic for the website? I mean, where is the line between "event" and "model"? What I'd like to do is have the fighter in the ring as part of the banner, sort of sticking out above it (head/shoulders). But, I don't want to do anything illegal, or that would require a model release. This would simply be an action shot from a fight the same promoter promoted.