I haven't rally ever gotten my picture taken for my cosplays, but this year I plan on having lots of pictures, so if you wanna, you should totally come by the TeamFortress2 photoshoot. I'm doing a plus size Fem!Heavy.
Also, if it gets approved, I will be helping run a Plus Sized Cosplay pannel, which I think would be great for your book, to be able to show the different types of people who cosplay and love to do it.