No one has the authority to say a composition is "wrong". Period. It may not work for them but hey that's why they make chocolate and vanilla ice cream.There are those that are rule followers. Rules mean everything to them, it keeps them in the correct lane and provides them with a "tribe" with which to belong. Those that are NOT rule followers are the inventors, explorers, creators etc. Once one of the rule followers gets their head around a new concept created by one of the non-rule followers, they along with respected tribe members make it a "rule". The cosmos is brought back into alignment for them.
As far as the image in question is concerned I like it. The vertical demarcation and the subsequent light falloff to the right in the background was done on purpose. The artist may have sensed a power dynamic between the two subjects or maybe there was tension between them. Who knows, only Anne knows why she did it but what she did do is create a story with her composition. That's what creative photography should strive for.
Eric