The more photos you take, the more it can become routine. Yes, you might be getting paid for the session and yes, we all like to make money. That being said, the mundane can set in and you might start looking for ways to keep it interesting.
So how does one go about doing such a thing? How do you keep it interesting. Well for me, that involves looking at the world in different ways. It might be integrating a reflection on the front of the lens with your black cell phone screen.
Or jumping in to those wide angles when the scene presents itself.
Throwing in some off camera lighting and carrying round that flash again.
Or simply doing fun things that involve the subject...such as daring them to hit you with that graduation cap. Either way, find the things that bring the fun back into taking photos. It's not always about just reaping the $$$$.