But you know how photos of kids tend to get voted here, yes? You hit a nail on the head with this though - anything that gives the sense of needing long exposure - basically, anything that looks like it needed fast film to shoot it - works in our understanding of where photographic grain should be seen. It's a basic, and nonsensical really, reaction. One might quibble with how far you've taken the whites of that dress, but that's all.