On the child protection issue. From my experience with newspapers as opposed to photographic studios, common good practice is if you use photos of kids you don't identify their names; if you use names then no photos. It's all about stranger danger, we tell the kids not to speak to people they don't know but if the stranger can approach the kid and say, 'Hi, you're Charlie Brown aren't you, I'm one of your Dad's friends - he asked me to give you a lift home from school tonight as he's a bit busy. He was telling me you just won the school sports cup last week...' etc. then he's not a stranger is he, knowing that much.
So with relevance to the above. Unsavoury as it may be to think some pervert may be poring over over promotional images of your kids, it's almost as if it isn't happening if you don't know and he doesn't know who they are. So as long as the photographer won't identify you with the images, I'd say from what I've seen above that there's little you should bother about.
Who knows, maybe somewhere some housewife is getting unnecessary over the photos from my wedding day that my photographer still has on her website