One paper I am always citing to my students when discussing composition in painting is: ‘Cultural differences in lateral biases on aesthetic judgments: The effect of native reading direction’
That's a very cool paper. Weird that LTR people have this bias more than RTL readers? It may have been an artefact of the study design, they state in the results that most RTL readers were bilingual (and the LTR readers presumably not, given that the study was done in Canada), that the study instructions were in English and that this may have primed the RTL readers to be more LTR-y.