prospective models need to learn that just being young and pretty doesn't mean you are a model. You actually have to open Vogue magazine (i recommend the italian version) and practice the poses.
Replying to emails doesn't hurt either.
The reason I bring this up is not to model-shame prospective models but I do want to identify that models have a responsibility to know their bodies, know their face know which poses are best for them and how to make themselves look great poses that the photographer or client want that are not necessarily their best poses.
As an example, some people have more loose skin around their neck or maybe they were not blessed with a long neck. These models need to recognize this and when the photographer turns you in a certain direction where you know your neck and/or chin may not be your best, you need to compensate by jutting out your jaw or stretching out your neck.
Another example is hands. Study ballet dancers and see how they hold their hands. Look through the magazines at models when they hold their hands to their face or touch their hair or shoulders and look graceful.
Models should be aware of their feet and try to keep their toes pointed (another ballet trick).
Models who are not size 0 should learn to use body angle to make a slimmer, more flattering image. Nobody looks good when they are strait on to the camera unless they are size 0.
Even though America's Next Top Model is full of hype and drama, there are actually really valuable nuggets for models and photographers in every episode.