I don't know every photographer obviously. But, I can't imagine that being done. It would be the opposite of helpful for your pageant career.
The only way I can ever see that happening is if you somehow got involved with a photographer who was actually a pedophile doing this for his own sick pleasure and he convinced you that it would be a good idea.
But most pageant photographers are women, and the men are most definitely gay. There's a lot of flamboyantly gay men in the pageant world. Some pageants are run by gay couples. I know some of them and they are the funniest, sweetest guys. Not that women and gay men can't be pedophiles, but I'm just saying as long as I've been in pageants I've never been made to do anything creepy, or seen anyone try to do anything creepy with my child.
When you get photos done, there are a few different kinds. You might get glitz or natural or both, depending on what types of pageants you do. But you mostly need headshots (face only or head and shoulders only) because that's what you use for the photogenic event. Photogenic is in pretty much every pageant, almost always an optional event but you kind of have to enter it because even though it's optional, it's usually part of your scoring for the supreme titles so you kind of have to do it.
Then there are portfolio shots. A lot of pageants have a portfolio contest too. These are full length shots, usually theme photos or set up like a scene- a good example of this is JB standing on a tire swing wearing summer clothes.
I've never seen anything in the way of nude portfolio shots. I can't imagine pageants directors or judges accepting such a photo, or what event it could possibly be judged. The other thing is that you wouldn't be able to print it because you wouldn't be able to let it be publically seen- and usually the portfolio winners photos are printed in the pageant book or program.
As for nude photos helping with modeling...my kid has done a little bit of modeling and acting (not much) but the advice I got from her agent was either don't do pageants, or, pretend you don't do pageants. The two worlds are definitely separate. Legitimate kid's modeling wants normal looking kids who look fresh and natural, not pageant robots with three inches of makeup on. Not that my kid's a robot but thats what the modeling world thinks. Think about kids you see in like a JC Penny catalog for example. They wear makeup but it doesn't look like they do, and they're dressed like regular children.
Pageants are a fun hobby but pageant photos will do nothing to help your modeling career. And I can't imagine nude photos of a child being helpful in the modeling world.
Now, with all that being said, I wouldn't be surprised if someone was taking inappropriate pictures of JB, whether it was her parents or someone they were allowing to do this. I think that just because of various things I've read on this forum as well as the evidence of her being abused.