Xian was the first.
At Apache, she was the first model I created images of (first as sketches, later as photos). And while I loved the images I captured, there were so many quality concerns with the digital images that I was inspired to solve the problems and get it right. The solutions are technical, having to do with camera sensors and lighting techniques.
But I was inspired to go the next level. Create better images and new ideas. Grow.
I guess that is what a Muse does for you.