It is unrealistic because in the time of Kings and Queens, the Queen or princess was pressured to have produce children soon after marriage. They needed heirs to the throne, but it was also traditon to have children quickly, and it meant the couple was able to have children and there was nothing wrong with them and it also meant there wasn't anything wrong with their sex life or relationship.
I think the picture is innocent, it's sweet that the prince is kneeling behind Cinderella and looking like he's touching his heart. But the picture is ugly in how it's drawn, and Cinderella's hair is too light and the Prince's hair should be black or much darker brown.
I thought I saw Snow White's wedding dress in art that was made for the movie but never got in. I don't remember it in deleted scenes, I'll have to check sometime. I think I remember it from old books made for the film, though. I think I've seen it on a sculpture of Snow White and the Prince, though, and I think it is her official one because it looks like the one I've seen before, maybe Disney was thinking of using it for the film.
Tell me
Ariel'sprince, is the wedding dress you know on
this sculpture?