Speaking as a photographer, most photographers do a model call via their pages or their social media. Models generally get a session with no session fee and a limited number of digitals for use, with the option to buy more at a discount.
I’m a former wildlife/nature photographer who started doing events and moved into some portrait work as well. I’ve only recently started doing the later, and even with my small social media footprint, I get numerous responses when I post model calls. And I’m not fabulous by any means. lol
I do not require the model to do anything, the photos are for my advertising use, unless it is a senior rep or sponsored rider scenario. In that case, part of their requirement is to advertise for me.
ETA- Low key photos in my area get the cricket response, so it is a lot about finding out what the market wants and working within those boundaries. I am working on a low key idea that I think will get people booking it, but it’s a not a standard black background session.