I agree with what both bodatheyoda and Ashurachan said. Also, I find it super helpful to have another someone who isn't one of the models or the photographer, but just like someone as in a friend of the cosplay model(s) and someone who more or less knows about the character(s) standing around the photoshoot area. They're really great at spotting things that both the model and the photographer would not notice since we're sooo busy focusing on the photographing itself. I always encourage to have other people like friends or even my family to come and make sure things go smoothly because I know I hate it when there is something that needed fixed and neither the cosplayer and myself noticed after the photoshoot.
2016/2017 Cosplay plans:
Cai Wenji (Dynasty Warriors 8) | Horou (Toukiden Kiwami) | Lu Yan'er (JX3/JianWang3)?
Cosplayer and photographer. Follow me at my DA, twitter, or my tumblr!