1) Be Prepared
2) Practice Posing (look through magazines, watch how to videos)
3) Get a Good Night Rest
4) Wash face before you arrive to shoot
5) Relax and listen to the photographer
6) Give feedback
7) Avoid alcohol 24 hours before the shoot
8) Arrive on time
9) Be Professional
10) Avoid bringing friends, family or spouses
Although these are simple rules, it's important to understand them in detail before your next shoot. It's better to be prepared than not.
"More Than A Model"