What is really awesome about a muse like Sadie is that she has awesome creative ideas. She loves to get photographed in ideas I have. But at the same time she will say "hey how about we try this idea" for some things too. Not only do the suggestions inspire me, but they also make me grow as a photographer. I need to learn how to take her concepts and make them come to life in the camera. So the shoots become a real give and take and ideas start to flow. At the end of the day we have created so much interesting art and had an awesome time at it too.
I also find that the creativity will then flow to other shoots. I got done with one shoot with Sadie and the next evening I was still so inspired I took my 10 year old daughter out with a "lightsaber" and a strobe and got some Jedi shots. What is the best is that as I get more shoots and more photos I like then I get more confidence. I find that I can set up shoots faster, and get more of what I have in my minds eye for a final photo product. People will tell me "I cannot shoot like you, it comes so easy for you". Well it didn't used to come easy. It was only with shooting a lot, and over time finding great muses, that I started to actually get good and get to the point of being able to see the shots and know how to get them taken.
So the bottom line is to shoot a lot, find a muse or two, and work hard at getting creative. Getting creative is hard. It is fun, but it is also hard. So go out and have some hard fun.