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
The word and concept of "the rule" should be considered a simple warning that such and such, compositional choices or, any forthcoming considered decision taking, of the matter, visual, political, social, or as guidance of any type, must be approached with the vital forewarning that, in this case, such a resulting composition using the questionable choice, of breaking "the Rule", is most often unsuccessful, thus the reason it is commonly considered prohibited; the rational reason it becomes a "rule".
There are many, many reasons that artists break "rules" or work within their framework, too many to make much sense of, for most people and creative disciplines, which often embrace rules as sound dogma engraved in stone.
Flexibility and the ability, IMO, to intelligently or intuitively recognize the opportunities within a composition and fulfill that image or plastic design, is what all 'artists' AND crafts persons need to work at, knowing only a small percentage of folks will consistently make the mark, even if it is itself only a percentage of their own endeavors.
Creating within rules will never be appreciated 100%, by any audience, unless it consist of a very small group of approving, like minded, persons, who find their expectations clearly and cleanly met!