Inspiration and character traps

Hang around in Romancelandia a bit and you will see many authors use pictures of actors, models, polo players etc for inspiration for their characters. Some authors return time and again to familiar inspiration while others choose different ones. Both approaches can work because ultimately it is not about how a character looks but what is under his skin. However the first approach can lead to character burn out as you keep mining in the same place.
As you write more books, you need to be aware...