Models need well rounded portfolios as well as the photographer. It's in our common interest that we both do well. Model photography is "created illusions".
The better images don't just happen. It requires the skills of both the model & the photographer.
Model Shoot (slideshow) http://manycoyotes.com/#!/page/137359/photo-shoot-model
Choosing a photographer: Look at their work, it's all about the photography.