most models have like their staple poses and facial expressions. they like to call it their signature pose. some have a set of current popular poses that they practice to perfection. and then there are some models who come on set like a clean canvas. they have no poses in there head. they don't want to do the industry popular poses. ie; the broken shoulders with hands on hips. instead, they want to be used as your paint brush to create new art. their open to anything. they laugh at nothing. they understand and respect the creative process.
some photogs seek the clean canvas model. some seek the broken shoulders with hands on hips. it's all good.