Don't forget to have fun on a shot. 

Most ego-centric  fashion photographers will tell you that you are only there to be a breathing prop - If that is how they act.... So be it, let them do whatever they want.

Now on the other hand if you find yourself working with a photographer who cares about getting the best photographs that you can. please note that there is a fine line between input and sounding like a diva... No one wants to work with a diva. But between shots while the photographer is setting up the scene... Look around and if there is a thing you think might make a good pic recommend it. 

Example this swing