It's an FPS right? The model is bad right? So, cut the body out of the ugly predator and leave just the arms
Change the name from predator to something similar like Carnivore... Um, that's already used... How about Predacula? An odd mix of Predator and Dracula game...
About making the jungle, use the unlimited terrain and scatter some good models of trees on it(and maybe some chunk of rocks, etc).